diff --git a/inputs/13/real.txt b/inputs/13/real.txt
new file mode 100644
index 0000000..8a8ee23
--- /dev/null
+++ b/inputs/13/real.txt
@@ -0,0 +1,1279 @@
+Button A: X+23, Y+33
+Button B: X+62, Y+25
+Prize: X=6801, Y=3810
+
+Button A: X+31, Y+56
+Button B: X+27, Y+16
+Prize: X=18354, Y=8640
+
+Button A: X+45, Y+86
+Button B: X+30, Y+11
+Prize: X=5640, Y=8462
+
+Button A: X+39, Y+66
+Button B: X+97, Y+46
+Prize: X=9362, Y=7100
+
+Button A: X+66, Y+11
+Button B: X+11, Y+34
+Prize: X=4577, Y=8227
+
+Button A: X+73, Y+14
+Button B: X+94, Y+95
+Prize: X=10129, Y=9101
+
+Button A: X+65, Y+25
+Button B: X+59, Y+93
+Prize: X=2109, Y=1233
+
+Button A: X+19, Y+90
+Button B: X+67, Y+71
+Prize: X=3091, Y=8236
+
+Button A: X+74, Y+38
+Button B: X+17, Y+81
+Prize: X=3375, Y=7587
+
+Button A: X+47, Y+13
+Button B: X+12, Y+50
+Prize: X=19038, Y=924
+
+Button A: X+45, Y+21
+Button B: X+22, Y+37
+Prize: X=6821, Y=8669
+
+Button A: X+71, Y+29
+Button B: X+36, Y+96
+Prize: X=4434, Y=7014
+
+Button A: X+15, Y+55
+Button B: X+60, Y+17
+Prize: X=15440, Y=4357
+
+Button A: X+80, Y+49
+Button B: X+48, Y+90
+Prize: X=5328, Y=7566
+
+Button A: X+22, Y+48
+Button B: X+69, Y+35
+Prize: X=18409, Y=11853
+
+Button A: X+76, Y+39
+Button B: X+39, Y+72
+Prize: X=7655, Y=4812
+
+Button A: X+25, Y+30
+Button B: X+98, Y+21
+Prize: X=7277, Y=3999
+
+Button A: X+59, Y+42
+Button B: X+12, Y+31
+Prize: X=4477, Y=5051
+
+Button A: X+16, Y+35
+Button B: X+32, Y+21
+Prize: X=3696, Y=16097
+
+Button A: X+61, Y+27
+Button B: X+14, Y+49
+Prize: X=8585, Y=19166
+
+Button A: X+15, Y+49
+Button B: X+54, Y+27
+Prize: X=5009, Y=4005
+
+Button A: X+56, Y+77
+Button B: X+67, Y+28
+Prize: X=6554, Y=6062
+
+Button A: X+18, Y+64
+Button B: X+76, Y+72
+Prize: X=4220, Y=5688
+
+Button A: X+34, Y+16
+Button B: X+19, Y+36
+Prize: X=1612, Y=2328
+
+Button A: X+28, Y+11
+Button B: X+20, Y+45
+Prize: X=3100, Y=1755
+
+Button A: X+11, Y+36
+Button B: X+40, Y+21
+Prize: X=2630, Y=7616
+
+Button A: X+46, Y+12
+Button B: X+36, Y+59
+Prize: X=11292, Y=8388
+
+Button A: X+69, Y+19
+Button B: X+14, Y+49
+Prize: X=18362, Y=2812
+
+Button A: X+15, Y+95
+Button B: X+77, Y+47
+Prize: X=5794, Y=9374
+
+Button A: X+27, Y+87
+Button B: X+64, Y+18
+Prize: X=6444, Y=2130
+
+Button A: X+20, Y+67
+Button B: X+75, Y+56
+Prize: X=6795, Y=6167
+
+Button A: X+86, Y+61
+Button B: X+29, Y+82
+Prize: X=5464, Y=7070
+
+Button A: X+13, Y+79
+Button B: X+84, Y+13
+Prize: X=4021, Y=7957
+
+Button A: X+73, Y+13
+Button B: X+14, Y+77
+Prize: X=15266, Y=4754
+
+Button A: X+23, Y+98
+Button B: X+53, Y+23
+Prize: X=4336, Y=3466
+
+Button A: X+35, Y+13
+Button B: X+14, Y+63
+Prize: X=1925, Y=2738
+
+Button A: X+47, Y+14
+Button B: X+35, Y+72
+Prize: X=4048, Y=1320
+
+Button A: X+18, Y+61
+Button B: X+62, Y+28
+Prize: X=15782, Y=14681
+
+Button A: X+38, Y+13
+Button B: X+48, Y+79
+Prize: X=4736, Y=466
+
+Button A: X+23, Y+54
+Button B: X+71, Y+17
+Prize: X=7751, Y=4426
+
+Button A: X+90, Y+69
+Button B: X+39, Y+96
+Prize: X=8697, Y=9510
+
+Button A: X+63, Y+14
+Button B: X+22, Y+79
+Prize: X=10219, Y=6504
+
+Button A: X+45, Y+23
+Button B: X+12, Y+46
+Prize: X=2003, Y=1135
+
+Button A: X+54, Y+15
+Button B: X+27, Y+78
+Prize: X=17567, Y=14516
+
+Button A: X+34, Y+21
+Button B: X+11, Y+23
+Prize: X=12471, Y=5696
+
+Button A: X+67, Y+42
+Button B: X+37, Y+96
+Prize: X=7696, Y=10212
+
+Button A: X+28, Y+74
+Button B: X+36, Y+12
+Prize: X=396, Y=13702
+
+Button A: X+86, Y+48
+Button B: X+27, Y+49
+Prize: X=1407, Y=1905
+
+Button A: X+17, Y+36
+Button B: X+61, Y+37
+Prize: X=12574, Y=14609
+
+Button A: X+16, Y+28
+Button B: X+47, Y+27
+Prize: X=4372, Y=16648
+
+Button A: X+14, Y+40
+Button B: X+49, Y+41
+Prize: X=1771, Y=2981
+
+Button A: X+69, Y+17
+Button B: X+34, Y+73
+Prize: X=4756, Y=6277
+
+Button A: X+75, Y+93
+Button B: X+56, Y+13
+Prize: X=2786, Y=1705
+
+Button A: X+69, Y+30
+Button B: X+17, Y+70
+Prize: X=5156, Y=2680
+
+Button A: X+91, Y+92
+Button B: X+13, Y+64
+Prize: X=6734, Y=10012
+
+Button A: X+11, Y+37
+Button B: X+21, Y+11
+Prize: X=18964, Y=12956
+
+Button A: X+14, Y+35
+Button B: X+31, Y+23
+Prize: X=5314, Y=5119
+
+Button A: X+32, Y+13
+Button B: X+63, Y+83
+Prize: X=19490, Y=10380
+
+Button A: X+32, Y+62
+Button B: X+47, Y+20
+Prize: X=1260, Y=14382
+
+Button A: X+82, Y+22
+Button B: X+42, Y+65
+Prize: X=8018, Y=3387
+
+Button A: X+69, Y+42
+Button B: X+28, Y+55
+Prize: X=17829, Y=12213
+
+Button A: X+93, Y+48
+Button B: X+16, Y+57
+Prize: X=1715, Y=1860
+
+Button A: X+95, Y+24
+Button B: X+26, Y+97
+Prize: X=5246, Y=5033
+
+Button A: X+26, Y+71
+Button B: X+90, Y+31
+Prize: X=5182, Y=4701
+
+Button A: X+32, Y+23
+Button B: X+37, Y+91
+Prize: X=3504, Y=3549
+
+Button A: X+95, Y+46
+Button B: X+18, Y+48
+Prize: X=10177, Y=7442
+
+Button A: X+12, Y+62
+Button B: X+63, Y+20
+Prize: X=13535, Y=17316
+
+Button A: X+54, Y+18
+Button B: X+26, Y+57
+Prize: X=10796, Y=3707
+
+Button A: X+12, Y+48
+Button B: X+60, Y+31
+Prize: X=19664, Y=13962
+
+Button A: X+19, Y+38
+Button B: X+57, Y+16
+Prize: X=7340, Y=522
+
+Button A: X+47, Y+17
+Button B: X+34, Y+54
+Prize: X=13547, Y=1197
+
+Button A: X+21, Y+52
+Button B: X+34, Y+12
+Prize: X=18100, Y=9276
+
+Button A: X+91, Y+34
+Button B: X+30, Y+63
+Prize: X=5106, Y=5067
+
+Button A: X+64, Y+33
+Button B: X+11, Y+22
+Prize: X=11857, Y=17799
+
+Button A: X+13, Y+74
+Button B: X+28, Y+28
+Prize: X=3295, Y=8114
+
+Button A: X+67, Y+18
+Button B: X+30, Y+68
+Prize: X=7715, Y=4770
+
+Button A: X+85, Y+50
+Button B: X+22, Y+88
+Prize: X=9023, Y=10862
+
+Button A: X+18, Y+43
+Button B: X+70, Y+39
+Prize: X=18570, Y=7377
+
+Button A: X+17, Y+33
+Button B: X+30, Y+17
+Prize: X=4714, Y=3421
+
+Button A: X+14, Y+67
+Button B: X+72, Y+12
+Prize: X=808, Y=2628
+
+Button A: X+78, Y+15
+Button B: X+39, Y+65
+Prize: X=7020, Y=4685
+
+Button A: X+17, Y+46
+Button B: X+95, Y+57
+Prize: X=2389, Y=1863
+
+Button A: X+28, Y+97
+Button B: X+65, Y+47
+Prize: X=2192, Y=1892
+
+Button A: X+41, Y+71
+Button B: X+56, Y+17
+Prize: X=4078, Y=6742
+
+Button A: X+16, Y+40
+Button B: X+69, Y+25
+Prize: X=12681, Y=15365
+
+Button A: X+33, Y+55
+Button B: X+78, Y+38
+Prize: X=4260, Y=5812
+
+Button A: X+12, Y+45
+Button B: X+46, Y+14
+Prize: X=8392, Y=18642
+
+Button A: X+33, Y+14
+Button B: X+18, Y+27
+Prize: X=12749, Y=17332
+
+Button A: X+14, Y+65
+Button B: X+27, Y+24
+Prize: X=2596, Y=2728
+
+Button A: X+32, Y+62
+Button B: X+39, Y+14
+Prize: X=16653, Y=17268
+
+Button A: X+12, Y+40
+Button B: X+57, Y+37
+Prize: X=4217, Y=16825
+
+Button A: X+67, Y+44
+Button B: X+19, Y+46
+Prize: X=4645, Y=4748
+
+Button A: X+73, Y+89
+Button B: X+77, Y+21
+Prize: X=7505, Y=6745
+
+Button A: X+26, Y+13
+Button B: X+18, Y+44
+Prize: X=15034, Y=13357
+
+Button A: X+45, Y+61
+Button B: X+36, Y+12
+Prize: X=3492, Y=2084
+
+Button A: X+26, Y+52
+Button B: X+45, Y+14
+Prize: X=7208, Y=18704
+
+Button A: X+18, Y+41
+Button B: X+61, Y+15
+Prize: X=19617, Y=16443
+
+Button A: X+27, Y+55
+Button B: X+81, Y+15
+Prize: X=4455, Y=5475
+
+Button A: X+37, Y+60
+Button B: X+87, Y+13
+Prize: X=8407, Y=2618
+
+Button A: X+45, Y+12
+Button B: X+17, Y+71
+Prize: X=7194, Y=1125
+
+Button A: X+46, Y+17
+Button B: X+40, Y+70
+Prize: X=17324, Y=9138
+
+Button A: X+28, Y+50
+Button B: X+45, Y+25
+Prize: X=14211, Y=17625
+
+Button A: X+12, Y+70
+Button B: X+44, Y+33
+Prize: X=400, Y=1215
+
+Button A: X+86, Y+30
+Button B: X+78, Y+96
+Prize: X=5384, Y=2910
+
+Button A: X+21, Y+55
+Button B: X+48, Y+18
+Prize: X=2762, Y=6834
+
+Button A: X+20, Y+49
+Button B: X+68, Y+40
+Prize: X=16676, Y=13367
+
+Button A: X+43, Y+24
+Button B: X+21, Y+44
+Prize: X=18622, Y=3868
+
+Button A: X+64, Y+21
+Button B: X+26, Y+65
+Prize: X=1886, Y=7182
+
+Button A: X+92, Y+23
+Button B: X+17, Y+67
+Prize: X=6073, Y=5597
+
+Button A: X+14, Y+32
+Button B: X+23, Y+15
+Prize: X=14831, Y=9287
+
+Button A: X+86, Y+57
+Button B: X+14, Y+88
+Prize: X=7798, Y=8396
+
+Button A: X+71, Y+17
+Button B: X+22, Y+70
+Prize: X=5732, Y=6884
+
+Button A: X+11, Y+69
+Button B: X+87, Y+30
+Prize: X=9216, Y=13820
+
+Button A: X+25, Y+68
+Button B: X+71, Y+26
+Prize: X=8245, Y=18040
+
+Button A: X+52, Y+35
+Button B: X+15, Y+69
+Prize: X=2729, Y=2956
+
+Button A: X+81, Y+43
+Button B: X+16, Y+50
+Prize: X=4247, Y=7489
+
+Button A: X+15, Y+32
+Button B: X+43, Y+15
+Prize: X=18075, Y=2014
+
+Button A: X+45, Y+73
+Button B: X+53, Y+25
+Prize: X=5131, Y=7287
+
+Button A: X+95, Y+35
+Button B: X+14, Y+25
+Prize: X=6311, Y=3595
+
+Button A: X+24, Y+72
+Button B: X+65, Y+22
+Prize: X=2510, Y=14828
+
+Button A: X+12, Y+89
+Button B: X+80, Y+33
+Prize: X=6464, Y=7037
+
+Button A: X+11, Y+21
+Button B: X+53, Y+29
+Prize: X=14589, Y=11385
+
+Button A: X+51, Y+75
+Button B: X+37, Y+15
+Prize: X=17832, Y=3350
+
+Button A: X+58, Y+34
+Button B: X+13, Y+33
+Prize: X=15315, Y=7103
+
+Button A: X+58, Y+74
+Button B: X+79, Y+23
+Prize: X=8036, Y=6052
+
+Button A: X+91, Y+48
+Button B: X+11, Y+43
+Prize: X=2094, Y=3262
+
+Button A: X+35, Y+19
+Button B: X+16, Y+41
+Prize: X=10599, Y=14620
+
+Button A: X+30, Y+12
+Button B: X+41, Y+54
+Prize: X=13205, Y=13550
+
+Button A: X+18, Y+34
+Button B: X+46, Y+18
+Prize: X=478, Y=5554
+
+Button A: X+55, Y+19
+Button B: X+13, Y+50
+Prize: X=15778, Y=13621
+
+Button A: X+42, Y+14
+Button B: X+13, Y+35
+Prize: X=4802, Y=12646
+
+Button A: X+19, Y+95
+Button B: X+97, Y+56
+Prize: X=4759, Y=9638
+
+Button A: X+13, Y+68
+Button B: X+74, Y+73
+Prize: X=1371, Y=5601
+
+Button A: X+24, Y+65
+Button B: X+83, Y+12
+Prize: X=7732, Y=1364
+
+Button A: X+20, Y+34
+Button B: X+46, Y+14
+Prize: X=2532, Y=16552
+
+Button A: X+62, Y+20
+Button B: X+12, Y+60
+Prize: X=6086, Y=19340
+
+Button A: X+62, Y+98
+Button B: X+55, Y+20
+Prize: X=3900, Y=2550
+
+Button A: X+22, Y+45
+Button B: X+59, Y+33
+Prize: X=18781, Y=5858
+
+Button A: X+60, Y+29
+Button B: X+12, Y+45
+Prize: X=18440, Y=19558
+
+Button A: X+50, Y+19
+Button B: X+22, Y+39
+Prize: X=19748, Y=2366
+
+Button A: X+13, Y+74
+Button B: X+42, Y+50
+Prize: X=3997, Y=10084
+
+Button A: X+61, Y+17
+Button B: X+12, Y+62
+Prize: X=7708, Y=12832
+
+Button A: X+11, Y+31
+Button B: X+66, Y+14
+Prize: X=3048, Y=18244
+
+Button A: X+55, Y+16
+Button B: X+22, Y+49
+Prize: X=16336, Y=8296
+
+Button A: X+46, Y+12
+Button B: X+31, Y+64
+Prize: X=2535, Y=6632
+
+Button A: X+53, Y+25
+Button B: X+13, Y+21
+Prize: X=3569, Y=15621
+
+Button A: X+18, Y+59
+Button B: X+63, Y+17
+Prize: X=3770, Y=11192
+
+Button A: X+46, Y+12
+Button B: X+19, Y+37
+Prize: X=6196, Y=19736
+
+Button A: X+19, Y+73
+Button B: X+38, Y+25
+Prize: X=4199, Y=8026
+
+Button A: X+72, Y+60
+Button B: X+20, Y+87
+Prize: X=5724, Y=5403
+
+Button A: X+39, Y+11
+Button B: X+38, Y+72
+Prize: X=18434, Y=206
+
+Button A: X+20, Y+72
+Button B: X+70, Y+23
+Prize: X=7310, Y=7293
+
+Button A: X+41, Y+67
+Button B: X+50, Y+27
+Prize: X=422, Y=8325
+
+Button A: X+30, Y+80
+Button B: X+66, Y+14
+Prize: X=776, Y=5344
+
+Button A: X+11, Y+29
+Button B: X+63, Y+22
+Prize: X=15012, Y=17058
+
+Button A: X+13, Y+44
+Button B: X+85, Y+51
+Prize: X=17219, Y=6673
+
+Button A: X+25, Y+59
+Button B: X+39, Y+11
+Prize: X=17976, Y=15604
+
+Button A: X+59, Y+30
+Button B: X+22, Y+45
+Prize: X=8281, Y=6635
+
+Button A: X+38, Y+50
+Button B: X+85, Y+22
+Prize: X=4507, Y=1528
+
+Button A: X+13, Y+12
+Button B: X+16, Y+52
+Prize: X=2514, Y=5448
+
+Button A: X+52, Y+14
+Button B: X+15, Y+68
+Prize: X=5714, Y=7004
+
+Button A: X+41, Y+21
+Button B: X+26, Y+56
+Prize: X=17732, Y=13192
+
+Button A: X+72, Y+40
+Button B: X+22, Y+48
+Prize: X=18704, Y=8800
+
+Button A: X+80, Y+86
+Button B: X+81, Y+13
+Prize: X=11929, Y=6231
+
+Button A: X+72, Y+16
+Button B: X+21, Y+79
+Prize: X=14828, Y=5092
+
+Button A: X+62, Y+24
+Button B: X+28, Y+71
+Prize: X=9482, Y=4259
+
+Button A: X+31, Y+14
+Button B: X+14, Y+54
+Prize: X=914, Y=1338
+
+Button A: X+39, Y+17
+Button B: X+11, Y+50
+Prize: X=2698, Y=13446
+
+Button A: X+75, Y+39
+Button B: X+21, Y+74
+Prize: X=6363, Y=6652
+
+Button A: X+15, Y+81
+Button B: X+82, Y+51
+Prize: X=4348, Y=4281
+
+Button A: X+61, Y+24
+Button B: X+34, Y+75
+Prize: X=5283, Y=7563
+
+Button A: X+72, Y+33
+Button B: X+11, Y+39
+Prize: X=17203, Y=9617
+
+Button A: X+21, Y+52
+Button B: X+77, Y+44
+Prize: X=4540, Y=10560
+
+Button A: X+30, Y+14
+Button B: X+13, Y+41
+Prize: X=14049, Y=16261
+
+Button A: X+21, Y+41
+Button B: X+34, Y+17
+Prize: X=9712, Y=5542
+
+Button A: X+56, Y+87
+Button B: X+81, Y+15
+Prize: X=5004, Y=6444
+
+Button A: X+12, Y+66
+Button B: X+88, Y+13
+Prize: X=1260, Y=1278
+
+Button A: X+28, Y+62
+Button B: X+67, Y+28
+Prize: X=3746, Y=19504
+
+Button A: X+15, Y+61
+Button B: X+82, Y+29
+Prize: X=16461, Y=12602
+
+Button A: X+22, Y+59
+Button B: X+74, Y+33
+Prize: X=5892, Y=19334
+
+Button A: X+20, Y+47
+Button B: X+64, Y+41
+Prize: X=4156, Y=11048
+
+Button A: X+61, Y+37
+Button B: X+42, Y+84
+Prize: X=7381, Y=8047
+
+Button A: X+59, Y+11
+Button B: X+20, Y+42
+Prize: X=1850, Y=2756
+
+Button A: X+69, Y+25
+Button B: X+26, Y+73
+Prize: X=4751, Y=19072
+
+Button A: X+61, Y+21
+Button B: X+18, Y+58
+Prize: X=16458, Y=8618
+
+Button A: X+88, Y+39
+Button B: X+35, Y+66
+Prize: X=6246, Y=7716
+
+Button A: X+81, Y+20
+Button B: X+21, Y+67
+Prize: X=8802, Y=8293
+
+Button A: X+75, Y+89
+Button B: X+52, Y+12
+Prize: X=4336, Y=3008
+
+Button A: X+55, Y+18
+Button B: X+13, Y+36
+Prize: X=19484, Y=19592
+
+Button A: X+62, Y+35
+Button B: X+24, Y+45
+Prize: X=18008, Y=14615
+
+Button A: X+56, Y+30
+Button B: X+28, Y+48
+Prize: X=6720, Y=5580
+
+Button A: X+22, Y+53
+Button B: X+41, Y+15
+Prize: X=15194, Y=10016
+
+Button A: X+19, Y+52
+Button B: X+64, Y+25
+Prize: X=14612, Y=4460
+
+Button A: X+23, Y+11
+Button B: X+33, Y+57
+Prize: X=6641, Y=18797
+
+Button A: X+31, Y+68
+Button B: X+59, Y+15
+Prize: X=15183, Y=2170
+
+Button A: X+12, Y+32
+Button B: X+42, Y+29
+Prize: X=3366, Y=2917
+
+Button A: X+12, Y+34
+Button B: X+44, Y+14
+Prize: X=15992, Y=2860
+
+Button A: X+46, Y+93
+Button B: X+97, Y+23
+Prize: X=4212, Y=1245
+
+Button A: X+27, Y+17
+Button B: X+17, Y+45
+Prize: X=11411, Y=15891
+
+Button A: X+55, Y+20
+Button B: X+34, Y+71
+Prize: X=9870, Y=12505
+
+Button A: X+15, Y+39
+Button B: X+66, Y+41
+Prize: X=746, Y=7263
+
+Button A: X+95, Y+51
+Button B: X+21, Y+99
+Prize: X=8616, Y=10854
+
+Button A: X+95, Y+16
+Button B: X+70, Y+67
+Prize: X=2690, Y=1226
+
+Button A: X+14, Y+24
+Button B: X+94, Y+40
+Prize: X=9464, Y=4352
+
+Button A: X+33, Y+80
+Button B: X+58, Y+15
+Prize: X=19115, Y=18265
+
+Button A: X+72, Y+35
+Button B: X+11, Y+54
+Prize: X=12332, Y=6651
+
+Button A: X+25, Y+35
+Button B: X+39, Y+14
+Prize: X=3671, Y=1526
+
+Button A: X+12, Y+73
+Button B: X+98, Y+84
+Prize: X=8958, Y=13009
+
+Button A: X+95, Y+27
+Button B: X+38, Y+55
+Prize: X=4085, Y=4918
+
+Button A: X+33, Y+11
+Button B: X+14, Y+53
+Prize: X=9819, Y=2318
+
+Button A: X+88, Y+37
+Button B: X+53, Y+97
+Prize: X=3860, Y=3715
+
+Button A: X+72, Y+26
+Button B: X+48, Y+57
+Prize: X=2448, Y=1003
+
+Button A: X+46, Y+28
+Button B: X+18, Y+41
+Prize: X=11938, Y=17046
+
+Button A: X+12, Y+48
+Button B: X+74, Y+43
+Prize: X=19634, Y=15239
+
+Button A: X+95, Y+39
+Button B: X+46, Y+95
+Prize: X=10094, Y=10157
+
+Button A: X+82, Y+34
+Button B: X+31, Y+81
+Prize: X=8143, Y=7397
+
+Button A: X+46, Y+14
+Button B: X+31, Y+56
+Prize: X=15179, Y=3476
+
+Button A: X+92, Y+13
+Button B: X+34, Y+56
+Prize: X=9082, Y=2768
+
+Button A: X+41, Y+11
+Button B: X+62, Y+70
+Prize: X=804, Y=696
+
+Button A: X+90, Y+15
+Button B: X+59, Y+64
+Prize: X=4870, Y=1895
+
+Button A: X+43, Y+11
+Button B: X+27, Y+62
+Prize: X=11720, Y=8400
+
+Button A: X+64, Y+27
+Button B: X+24, Y+44
+Prize: X=5416, Y=2793
+
+Button A: X+53, Y+94
+Button B: X+51, Y+17
+Prize: X=6155, Y=5334
+
+Button A: X+30, Y+11
+Button B: X+23, Y+60
+Prize: X=2222, Y=1409
+
+Button A: X+11, Y+57
+Button B: X+49, Y+21
+Prize: X=5062, Y=13550
+
+Button A: X+33, Y+13
+Button B: X+57, Y+79
+Prize: X=4685, Y=14057
+
+Button A: X+13, Y+62
+Button B: X+72, Y+12
+Prize: X=2422, Y=4592
+
+Button A: X+21, Y+53
+Button B: X+59, Y+33
+Prize: X=4967, Y=10057
+
+Button A: X+69, Y+40
+Button B: X+28, Y+57
+Prize: X=17253, Y=11830
+
+Button A: X+25, Y+55
+Button B: X+71, Y+48
+Prize: X=7715, Y=7235
+
+Button A: X+45, Y+25
+Button B: X+14, Y+41
+Prize: X=1391, Y=4924
+
+Button A: X+51, Y+11
+Button B: X+14, Y+32
+Prize: X=14436, Y=9800
+
+Button A: X+65, Y+18
+Button B: X+21, Y+91
+Prize: X=3911, Y=2446
+
+Button A: X+53, Y+57
+Button B: X+79, Y+23
+Prize: X=2831, Y=2487
+
+Button A: X+38, Y+65
+Button B: X+55, Y+26
+Prize: X=17193, Y=7231
+
+Button A: X+36, Y+25
+Button B: X+14, Y+68
+Prize: X=2662, Y=7385
+
+Button A: X+51, Y+22
+Button B: X+19, Y+64
+Prize: X=11978, Y=2798
+
+Button A: X+31, Y+55
+Button B: X+40, Y+17
+Prize: X=12598, Y=2078
+
+Button A: X+16, Y+36
+Button B: X+50, Y+15
+Prize: X=2258, Y=1863
+
+Button A: X+22, Y+90
+Button B: X+81, Y+59
+Prize: X=6274, Y=10414
+
+Button A: X+58, Y+14
+Button B: X+35, Y+80
+Prize: X=4605, Y=19390
+
+Button A: X+24, Y+15
+Button B: X+20, Y+93
+Prize: X=2448, Y=6360
+
+Button A: X+44, Y+24
+Button B: X+18, Y+39
+Prize: X=7128, Y=5540
+
+Button A: X+81, Y+67
+Button B: X+90, Y+11
+Prize: X=7074, Y=1093
+
+Button A: X+51, Y+16
+Button B: X+12, Y+33
+Prize: X=12497, Y=10950
+
+Button A: X+89, Y+41
+Button B: X+47, Y+95
+Prize: X=4463, Y=3743
+
+Button A: X+20, Y+45
+Button B: X+26, Y+12
+Prize: X=4302, Y=8474
+
+Button A: X+22, Y+88
+Button B: X+89, Y+75
+Prize: X=6544, Y=11002
+
+Button A: X+30, Y+68
+Button B: X+57, Y+26
+Prize: X=5678, Y=18428
+
+Button A: X+24, Y+70
+Button B: X+75, Y+28
+Prize: X=18920, Y=19352
+
+Button A: X+69, Y+20
+Button B: X+14, Y+65
+Prize: X=19613, Y=12505
+
+Button A: X+50, Y+70
+Button B: X+58, Y+12
+Prize: X=8362, Y=7278
+
+Button A: X+87, Y+58
+Button B: X+11, Y+85
+Prize: X=2258, Y=5777
+
+Button A: X+71, Y+34
+Button B: X+11, Y+65
+Prize: X=1511, Y=3531
+
+Button A: X+63, Y+23
+Button B: X+31, Y+49
+Prize: X=4884, Y=4044
+
+Button A: X+49, Y+21
+Button B: X+22, Y+51
+Prize: X=4789, Y=2676
+
+Button A: X+21, Y+71
+Button B: X+49, Y+16
+Prize: X=17154, Y=7804
+
+Button A: X+37, Y+11
+Button B: X+49, Y+72
+Prize: X=13066, Y=14023
+
+Button A: X+90, Y+36
+Button B: X+53, Y+86
+Prize: X=6524, Y=4424
+
+Button A: X+71, Y+13
+Button B: X+17, Y+62
+Prize: X=5108, Y=12592
+
+Button A: X+16, Y+50
+Button B: X+50, Y+24
+Prize: X=10032, Y=7620
+
+Button A: X+55, Y+11
+Button B: X+13, Y+70
+Prize: X=6658, Y=10983
+
+Button A: X+14, Y+36
+Button B: X+55, Y+31
+Prize: X=15540, Y=1556
+
+Button A: X+34, Y+54
+Button B: X+27, Y+13
+Prize: X=12112, Y=8144
+
+Button A: X+68, Y+63
+Button B: X+77, Y+16
+Prize: X=9005, Y=6074
+
+Button A: X+52, Y+99
+Button B: X+59, Y+22
+Prize: X=4621, Y=4191
+
+Button A: X+57, Y+23
+Button B: X+27, Y+61
+Prize: X=13373, Y=1507
+
+Button A: X+39, Y+56
+Button B: X+40, Y+14
+Prize: X=15692, Y=11946
+
+Button A: X+50, Y+21
+Button B: X+17, Y+35
+Prize: X=4466, Y=13717
+
+Button A: X+12, Y+37
+Button B: X+54, Y+16
+Prize: X=8066, Y=12508
+
+Button A: X+54, Y+22
+Button B: X+14, Y+28
+Prize: X=1552, Y=7098
+
+Button A: X+24, Y+57
+Button B: X+66, Y+32
+Prize: X=4994, Y=12455
+
+Button A: X+39, Y+73
+Button B: X+49, Y+28
+Prize: X=4940, Y=5105
+
+Button A: X+63, Y+25
+Button B: X+26, Y+42
+Prize: X=2819, Y=2481
+
+Button A: X+87, Y+50
+Button B: X+34, Y+79
+Prize: X=9327, Y=6609
+
+Button A: X+88, Y+78
+Button B: X+12, Y+40
+Prize: X=4948, Y=4650
+
+Button A: X+78, Y+46
+Button B: X+14, Y+36
+Prize: X=16096, Y=12012
+
+Button A: X+75, Y+14
+Button B: X+22, Y+94
+Prize: X=6985, Y=6248
+
+Button A: X+29, Y+57
+Button B: X+33, Y+12
+Prize: X=434, Y=483
+
+Button A: X+60, Y+47
+Button B: X+13, Y+77
+Prize: X=3763, Y=5019
+
+Button A: X+42, Y+14
+Button B: X+51, Y+85
+Prize: X=5490, Y=7134
+
+Button A: X+74, Y+48
+Button B: X+16, Y+38
+Prize: X=10264, Y=2080
+
+Button A: X+42, Y+24
+Button B: X+13, Y+61
+Prize: X=1834, Y=4798
+
+Button A: X+47, Y+82
+Button B: X+50, Y+15
+Prize: X=14653, Y=17558
+
+Button A: X+74, Y+21
+Button B: X+17, Y+95
+Prize: X=7122, Y=7612
+
+Button A: X+18, Y+56
+Button B: X+89, Y+29
+Prize: X=7328, Y=5446
+
+Button A: X+36, Y+73
+Button B: X+57, Y+21
+Prize: X=1925, Y=3535
+
+Button A: X+53, Y+36
+Button B: X+13, Y+34
+Prize: X=9614, Y=6604
+
+Button A: X+30, Y+23
+Button B: X+22, Y+98
+Prize: X=3616, Y=6261
+
+Button A: X+37, Y+79
+Button B: X+87, Y+29
+Prize: X=1412, Y=1604
+
+Button A: X+37, Y+25
+Button B: X+14, Y+34
+Prize: X=728, Y=13612
+
+Button A: X+21, Y+51
+Button B: X+58, Y+25
+Prize: X=8630, Y=5411
+
+Button A: X+71, Y+80
+Button B: X+12, Y+85
+Prize: X=3871, Y=5005
+
+Button A: X+82, Y+37
+Button B: X+51, Y+84
+Prize: X=7154, Y=8351
+
+Button A: X+62, Y+42
+Button B: X+31, Y+66
+Prize: X=2976, Y=4626
+
+Button A: X+54, Y+22
+Button B: X+27, Y+62
+Prize: X=13463, Y=9180
+
+Button A: X+12, Y+50
+Button B: X+50, Y+12
+Prize: X=5058, Y=13152
+
+Button A: X+18, Y+52
+Button B: X+77, Y+29
+Prize: X=3147, Y=5029
+
+Button A: X+21, Y+86
+Button B: X+95, Y+66
+Prize: X=3578, Y=2700
+
+Button A: X+34, Y+78
+Button B: X+26, Y+14
+Prize: X=3866, Y=5902
+
+Button A: X+45, Y+28
+Button B: X+14, Y+42
+Prize: X=5409, Y=2902
+
+Button A: X+60, Y+29
+Button B: X+35, Y+66
+Prize: X=19625, Y=11658
+
+Button A: X+14, Y+49
+Button B: X+79, Y+38
+Prize: X=3957, Y=8128
+
+Button A: X+44, Y+12
+Button B: X+15, Y+77
+Prize: X=2978, Y=4166
+
+Button A: X+15, Y+36
+Button B: X+42, Y+13
+Prize: X=1040, Y=7437
+
+Button A: X+41, Y+30
+Button B: X+11, Y+65
+Prize: X=1311, Y=4775
+
+Button A: X+56, Y+19
+Button B: X+28, Y+62
+Prize: X=12940, Y=10005
+
+Button A: X+12, Y+38
+Button B: X+63, Y+41
+Prize: X=17435, Y=15109
+
+Button A: X+18, Y+86
+Button B: X+83, Y+25
+Prize: X=8962, Y=6406
+
+Button A: X+42, Y+18
+Button B: X+19, Y+52
+Prize: X=3636, Y=7386
+
+Button A: X+31, Y+22
+Button B: X+40, Y+97
+Prize: X=1803, Y=1554
+
+Button A: X+33, Y+43
+Button B: X+83, Y+28
+Prize: X=4286, Y=3581
+
+Button A: X+37, Y+50
+Button B: X+98, Y+19
+Prize: X=4671, Y=1548
+
+Button A: X+54, Y+27
+Button B: X+12, Y+95
+Prize: X=6096, Y=9812
+
+Button A: X+24, Y+80
+Button B: X+31, Y+16
+Prize: X=1359, Y=1648
+
+Button A: X+41, Y+11
+Button B: X+35, Y+73
+Prize: X=617, Y=13611
+
+Button A: X+22, Y+46
+Button B: X+72, Y+49
+Prize: X=10986, Y=636
+
+Button A: X+55, Y+14
+Button B: X+15, Y+41
+Prize: X=10895, Y=4037
+
+Button A: X+28, Y+28
+Button B: X+66, Y+13
+Prize: X=6920, Y=2892
+
+Button A: X+45, Y+13
+Button B: X+16, Y+51
+Prize: X=1883, Y=915
diff --git a/inputs/13/test.txt b/inputs/13/test.txt
new file mode 100644
index 0000000..912f482
--- /dev/null
+++ b/inputs/13/test.txt
@@ -0,0 +1,15 @@
+Button A: X+94, Y+34
+Button B: X+22, Y+67
+Prize: X=8400, Y=5400
+
+Button A: X+26, Y+66
+Button B: X+67, Y+21
+Prize: X=12748, Y=12176
+
+Button A: X+17, Y+86
+Button B: X+84, Y+37
+Prize: X=7870, Y=6450
+
+Button A: X+69, Y+23
+Button B: X+27, Y+71
+Prize: X=18641, Y=10279
diff --git a/solutions/12.zig b/solutions/12.zig
index 10e8536..8430b4f 100644
--- a/solutions/12.zig
+++ b/solutions/12.zig
@@ -2,6 +2,8 @@ const std = @import("std");
 const print = std.debug.print;
 const util = @import("util.zig");
 
+// Part Two seems just plain unfun. _Might_ come back to it, but...ugh.
+
 pub fn main() !void {
     const response = try part_one(false);
     print("{}\n", .{response});
diff --git a/solutions/13.zig b/solutions/13.zig
new file mode 100644
index 0000000..143f68f
--- /dev/null
+++ b/solutions/13.zig
@@ -0,0 +1,274 @@
+const std = @import("std");
+const print = std.debug.print;
+const util = @import("util.zig");
+const expect = std.testing.expect;
+
+pub fn main() !void {
+    const response = try part_two(false);
+    print("{}\n", .{response});
+}
+
+const CaseError = error{ ArithmeticError, InsolubleError, ZeroDivisionError };
+
+const Solution = struct { a: u32, b: u32 };
+const SolutionTakeTwo = struct { a: u64, b: u64 };
+
+const Case = struct {
+    ax: u32,
+    ay: u32,
+    bx: u32,
+    by: u32,
+    prizex: u32,
+    prizey: u32,
+    pub fn from_lines(a_line: []const u8, b_line: []const u8, prize_line: []const u8) anyerror!Case {
+        // Looks like there are no regexes in Zig :shrug:
+        print("DEBUG - parsing a_line: {s}\n", .{a_line});
+        const start_of_ax: usize = 12;
+        const end_of_ax: usize = std.mem.indexOf(u8, a_line, ",").?;
+        const start_of_ay: usize = std.mem.indexOf(u8, a_line, "Y").? + 2;
+        const ax = try std.fmt.parseInt(u32, a_line[start_of_ax..end_of_ax], 10);
+        const ay = try std.fmt.parseInt(u32, a_line[start_of_ay..a_line.len], 10);
+
+        const start_of_bx: usize = 12;
+        const end_of_bx: usize = std.mem.indexOf(u8, b_line, ",").?;
+        const start_of_by: usize = std.mem.indexOf(u8, b_line, "Y").? + 2;
+        const bx = try std.fmt.parseInt(u32, b_line[start_of_bx..end_of_bx], 10);
+        const by = try std.fmt.parseInt(u32, b_line[start_of_by..b_line.len], 10);
+
+        const start_of_prizex: usize = 9;
+        const end_of_prizex: usize = std.mem.indexOf(u8, prize_line, ",").?;
+        const start_of_prizey: usize = std.mem.indexOf(u8, prize_line, "Y").? + 2;
+        const prizex = try std.fmt.parseInt(u32, prize_line[start_of_prizex..end_of_prizex], 10);
+        const prizey = try std.fmt.parseInt(u32, prize_line[start_of_prizey..prize_line.len], 10);
+
+        return Case{ .ax = ax, .ay = ay, .bx = bx, .by = by, .prizex = prizex, .prizey = prizey };
+    }
+
+    pub fn solve(self: *const Case) CaseError!Solution {
+        // Logic:
+        // * Increment b (since b is cheaper than a) until x and y values are >= targets
+        //   * If x and y values are equal to the targets, _and_ b <= 100, then we're done - return
+        // * Repeatedly:
+        //    * Increment a, then decrement b until _at least one_ x or y value is <= targets
+        //    * If both x and y are equal to targets, and b <= 100, then return
+        //    * Else:
+        //      * Increment b until both x and y are >= targets
+        //      * If a is 100, the Case is insoluble. Else, loop (so a will get incremented as the loop starts again)
+
+        var a: u32 = 0;
+        var b: u32 = 0;
+        b = @max(self.prizex / self.bx, self.prizey / self.by);
+        // There's probably a way to do this in a single pass, but :shrug:
+        if (self.bx * b < self.prizex or self.by * b < self.prizey) {
+            b += 1;
+        }
+        // This _shouldn't_ be necessary, but I don't trust myself with Zig arithmetic yet!
+        if (self.bx * b < self.prizex or self.by * b < self.prizey) {
+            print("Arithmetic error while operating on {}\n", .{self});
+            return CaseError.ArithmeticError;
+        }
+
+        if (self.bx * b == self.prizex and self.by * b == self.prizey and b <= 100) {
+            return .{ .a = 0, .b = b };
+        }
+
+        while (true) {
+            // Could _probably do this as part of the `while` loop definition, but it makes more sense to my brain
+            // as the first statement like this.
+            a += 1;
+            while (self.ax * a + self.bx * b > self.prizex or self.ay * a + self.by * b > self.prizey) : (b -= 1) {
+                if (b == 0) {
+                    return CaseError.InsolubleError;
+                }
+            }
+            if (self.ax * a + self.bx * b == self.prizex and self.ay * a + self.by * b == self.prizey and b <= 100) {
+                return .{ .a = a, .b = b };
+            } else {
+                while (self.ax * a + self.bx * b < self.prizex and self.ay * a + self.by * b < self.prizey) : (b += 1) {}
+                if (a == 100) {
+                    return CaseError.InsolubleError;
+                } // else - continue loop, increment a, keep trying
+            }
+        }
+    }
+};
+
+const CaseTakeTwo = struct {
+    ax: u64,
+    ay: u64,
+    bx: u64,
+    by: u64,
+    prizex: u64,
+    prizey: u64,
+    pub fn from_lines(a_line: []const u8, b_line: []const u8, prize_line: []const u8) anyerror!CaseTakeTwo {
+        // Looks like there are no regexes in Zig :shrug:
+        print("DEBUG - parsing a_line: {s}\n", .{a_line});
+        const start_of_ax: usize = 12;
+        const end_of_ax: usize = std.mem.indexOf(u8, a_line, ",").?;
+        const start_of_ay: usize = std.mem.indexOf(u8, a_line, "Y").? + 2;
+        const ax = try std.fmt.parseInt(u64, a_line[start_of_ax..end_of_ax], 10);
+        const ay = try std.fmt.parseInt(u64, a_line[start_of_ay..a_line.len], 10);
+
+        const start_of_bx: usize = 12;
+        const end_of_bx: usize = std.mem.indexOf(u8, b_line, ",").?;
+        const start_of_by: usize = std.mem.indexOf(u8, b_line, "Y").? + 2;
+        const bx = try std.fmt.parseInt(u64, b_line[start_of_bx..end_of_bx], 10);
+        const by = try std.fmt.parseInt(u64, b_line[start_of_by..b_line.len], 10);
+
+        const start_of_prizex: usize = 9;
+        const end_of_prizex: usize = std.mem.indexOf(u8, prize_line, ",").?;
+        const start_of_prizey: usize = std.mem.indexOf(u8, prize_line, "Y").? + 2;
+        const prizex = try std.fmt.parseInt(u64, prize_line[start_of_prizex..end_of_prizex], 10) + 10000000000000;
+        const prizey = try std.fmt.parseInt(u64, prize_line[start_of_prizey..prize_line.len], 10) + 10000000000000;
+
+        return CaseTakeTwo{ .ax = ax, .ay = ay, .bx = bx, .by = by, .prizex = prizex, .prizey = prizey };
+    }
+
+    pub fn solve(self: *const CaseTakeTwo) CaseError!SolutionTakeTwo {
+        // The iterative approach doesn't work here :P take the exact numerical approach.
+        // A little algebraic rearrangement gives us:
+        //
+        // ```
+        // b ( x_1 y_2 - x_2 y_1) = x_1 t_y - y_1 t_x
+        // ```
+        //
+        // So, if the LHS factor does not divide the RHS factor, we know the case is insoluble;
+        // and if they _do_ divide, this gives us an equation for b.
+        // (Question - there could be cases where there are multiple solutions, what would that look like? Cross that
+        // bridge when we come to it.)
+
+        // Because heaven forbid we have a filthy <gasp> *NEGATIVE NUMBER* in our data.
+        // Won't somebody please think of the children!
+        if ((self.ax * self.by) >= (self.bx * self.ay)) {
+            const lhs = (self.ax * self.by) - (self.bx * self.ay);
+            if (lhs == 0) {
+                print("SOMETHING WEIRD HAPPENED - zero-division in case {}\n", .{self});
+                return CaseError.ZeroDivisionError;
+            }
+            if (self.ax * self.prizey <= self.ay * self.prizex) {
+                // i.e. lhs and rhs would have different signs
+                return CaseError.InsolubleError;
+            }
+            const rhs = (self.ax * self.prizey - self.ay * self.prizex);
+            if (rhs % lhs != 0) {
+                return CaseError.InsolubleError;
+            }
+            // We know that lhs divides rhs exactly, so...
+            const b = @divExact(rhs, lhs);
+            print("DEBUG - b is {}\n", .{b});
+
+            const a_calc_numerator = self.prizex - (b * self.bx);
+            const a_calc_denominator = self.ax;
+            if (a_calc_numerator % a_calc_denominator != 0) {
+                return CaseError.InsolubleError;
+            }
+            const a = @divExact(a_calc_numerator, a_calc_denominator);
+            return SolutionTakeTwo{ .a = a, .b = b };
+        } else {
+            const lhs = (self.bx * self.ay) - (self.ax * self.by);
+            if (lhs == 0) {
+                print("SOMETHING WEIRD HAPPENED - zero-division in case {}\n", .{self});
+                return CaseError.ZeroDivisionError;
+            }
+            if (self.ay * self.prizex <= self.ax * self.prizey) {
+                // i.e. lhs and rhs would have different signs
+                return CaseError.InsolubleError;
+            }
+            const rhs = (self.ay * self.prizex - self.ax * self.prizey);
+            if (rhs % lhs != 0) {
+                return CaseError.InsolubleError;
+            }
+            // We know that lhs divides rhs exactly, so...
+            const b = @divExact(rhs, lhs);
+            print("DEBUG - b is {}\n", .{b});
+
+            const a_calc_numerator = self.prizex - (b * self.bx);
+            const a_calc_denominator = self.ax;
+            if (a_calc_numerator % a_calc_denominator != 0) {
+                return CaseError.InsolubleError;
+            }
+            const a = @divExact(a_calc_numerator, a_calc_denominator);
+            return SolutionTakeTwo{ .a = a, .b = b };
+        }
+    }
+};
+
+fn part_one(is_test_case: bool) anyerror!u128 {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const input_file = try util.getInputFile("13", is_test_case);
+    const data = try util.readAllInputWithAllocator(input_file, allocator);
+    defer allocator.free(data);
+
+    var it = std.mem.splitScalar(u8, data, '\n');
+    var cases = std.ArrayList(Case).init(allocator);
+    defer cases.deinit();
+    while (true) {
+        const a_line = it.next().?;
+        const b_line = it.next().?;
+        const prize_line = it.next().?;
+        _ = it.next();
+
+        try cases.append(try Case.from_lines(a_line, b_line, prize_line));
+
+        if (it.peek() == null) {
+            break;
+        }
+    }
+    var total: u32 = 0;
+    for (cases.items) |case| {
+        print("Solution to case {}", .{case});
+        if (case.solve()) |solution| {
+            print(" is {}\n", .{solution});
+            total += solution.a * 3 + solution.b;
+        } else |_| {
+            print(" is impossible\n", .{});
+        }
+    }
+    return total;
+}
+
+fn part_two(is_test_case: bool) anyerror!u128 {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const input_file = try util.getInputFile("13", is_test_case);
+    const data = try util.readAllInputWithAllocator(input_file, allocator);
+    defer allocator.free(data);
+
+    var it = std.mem.splitScalar(u8, data, '\n');
+    var cases = std.ArrayList(CaseTakeTwo).init(allocator);
+    defer cases.deinit();
+    while (true) {
+        const a_line = it.next().?;
+        const b_line = it.next().?;
+        const prize_line = it.next().?;
+        _ = it.next();
+
+        try cases.append(try CaseTakeTwo.from_lines(a_line, b_line, prize_line));
+
+        if (it.peek() == null) {
+            break;
+        }
+    }
+    var total: u64 = 0;
+    for (cases.items) |case| {
+        print("Solution to case {}", .{case});
+        if (case.solve()) |solution| {
+            print(" is {}\n", .{solution});
+            total += solution.a * 3 + solution.b;
+        } else |_| {
+            print(" is impossible\n", .{});
+        }
+    }
+    return total;
+}
+
+test "part_one" {
+    const part_one_response = try part_one(true);
+    print("DEBUG - part_one_response is {}\n", .{part_one_response});
+    try expect(part_one_response == 480);
+}