diff --git a/NOTES.md b/NOTES.md
index dea61e5..4536be5 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -12,6 +12,7 @@ Notes, thoughts, or questions that arose as I implemented the solutions. Hopeful
 * Better error-handling than GoLang's (though that bar is set _real_ low). I have only just scratched the surface, though, it looks interestingly powerful - might well be even better than I've realized at this point!
 * Creation of "bare" structs - i.e. you can do `myFunction(.{thing})` rather than `myFunction(StructName{thing})` (looking at you, GoLang)
 * [Continue expressions](https://ziglang.org/documentation/master/#while) - don't need to remember to put the index-incrementing code at the end of every branch!
+  * And returning from `while` loops with `break <value>` and `else <value>`!
 * Great powerful `switch` syntax (though not as powerful as Rust's)
 * Labelled loops - _usually_ should be avoided, but helpful on occasion!
 * `defer` - though, unlike in GoLang where it's a nice-to-have that allows one to do cleanup, here it is _absolutely essential_ for all the manual `deinit`s and `free`s
diff --git a/inputs/18/real.txt b/inputs/18/real.txt
new file mode 100644
index 0000000..162d1e7
--- /dev/null
+++ b/inputs/18/real.txt
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+15,26
+49,34
+58,54
+52,68
+51,58
+68,10
+0,45
+0,35
+6,57
+4,4
+40,30
+41,0
+2,48
+27,46
+29,6
+22,48
+40,11
+24,14
+10,17
+20,42
+2,47
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+5,38
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+30,45
+0,11
+42,49
+69,54
+48,6
+37,44
+1,58
+67,40
+4,46
+0,25
+27,44
+27,40
+29,34
+41,6
+68,53
+6,52
+67,14
+39,0
+7,62
+4,60
+40,35
+24,30
+63,60
+5,52
+51,66
+52,33
+41,2
+20,12
+66,62
+38,0
+6,50
+9,66
+32,70
+14,5
+16,58
+47,28
+2,9
+62,62
+57,60
+0,55
+22,68
+35,50
+44,68
+40,34
+19,70
+17,20
+32,2
+6,54
+68,12
+28,36
+14,68
+14,22
+40,8
+56,16
+57,68
+69,0
+14,52
+26,28
+48,58
+48,10
+70,24
+10,38
+64,1
+45,46
+4,16
+15,60
+44,58
+32,40
+40,66
+57,0
+37,36
+9,30
+62,35
+36,4
+29,42
+16,32
+70,32
+30,46
+5,48
+4,14
+25,70
+64,20
+4,12
+19,20
+0,18
+8,56
+26,57
+33,0
+42,24
+47,46
+0,52
+8,10
+70,13
+18,42
+10,6
+50,34
+6,18
+64,11
+62,28
+2,35
+20,53
+70,0
+59,4
+11,50
+6,17
+24,53
+20,22
+2,18
+13,0
+25,34
+21,40
+16,47
+2,62
+69,50
+40,48
+54,41
+16,37
+46,49
+0,67
+70,22
+4,64
+16,24
+24,18
+26,64
+16,54
+2,67
+32,30
+22,14
+16,26
+14,18
+30,7
+36,22
+6,15
+4,38
+70,9
+9,26
+0,68
+40,64
+1,70
+69,16
+7,50
+43,6
+24,64
+35,2
+62,37
+62,11
+2,26
+65,12
+56,44
+19,58
+30,24
+68,9
+2,68
+54,6
+7,12
+8,43
+18,22
+46,48
+11,46
+2,16
+58,10
+10,56
+62,10
+34,47
+38,65
+64,22
+8,21
+16,64
+62,54
+6,21
+30,32
+16,33
+40,10
+26,46
+6,16
+20,47
+53,28
+48,65
+32,46
+48,27
+28,5
+11,32
+14,25
+33,2
+0,24
+26,52
+36,49
+46,50
+34,43
+26,51
+20,52
+56,64
+4,21
+67,58
+16,29
+49,58
+63,32
+38,9
+36,3
+50,58
+44,6
+9,64
+15,36
+64,16
+2,54
+2,40
+17,56
+20,23
+4,20
+2,64
+14,24
+23,16
+6,64
+18,12
+35,70
+68,8
+22,32
+24,24
+18,54
+62,60
+48,32
+7,14
+13,60
+70,4
+24,44
+19,46
+23,40
+42,58
+38,21
+15,0
+62,52
+44,59
+16,43
+40,0
+0,43
+24,68
+3,4
+14,33
+70,43
+36,41
+14,61
+12,22
+56,60
+34,36
+19,0
+16,56
+6,10
+19,28
+46,36
+46,25
+26,42
+12,54
+22,53
+11,12
+25,0
+39,64
+25,60
+8,29
+66,2
+13,66
+6,60
+0,4
+9,56
+24,50
+32,44
+42,0
+59,14
+56,5
+13,48
+2,34
+10,59
+0,3
+18,7
+70,2
+32,24
+17,60
+18,0
+62,8
+24,51
+6,27
+68,48
+46,51
+50,4
+4,62
+62,17
+51,36
+6,59
+58,65
+18,17
+40,6
+12,25
+10,69
+28,65
+66,0
+64,5
+4,7
+13,6
+56,46
+31,46
+24,19
+20,38
+68,52
+2,12
+66,25
+58,2
+18,65
+6,55
+56,3
+59,12
+46,46
+8,69
+16,16
+18,51
+58,68
+15,50
+21,12
+52,48
+60,10
+15,44
+41,26
+42,55
+14,20
+66,29
+46,63
+44,21
+70,57
+14,54
+70,55
+6,29
+41,10
+3,20
+37,24
+7,38
+26,31
+42,66
+45,0
+20,24
+52,6
+45,56
+27,58
+11,14
+54,10
+26,36
+30,11
+26,27
+3,32
+46,42
+52,25
+56,28
+40,55
+66,18
+28,9
+52,10
+70,36
+12,67
+4,30
+44,28
+22,62
+54,30
+20,2
+70,46
+28,55
+38,14
+60,54
+40,27
+46,68
+3,58
+37,58
+20,50
+20,34
+6,38
+60,4
+66,67
+1,16
+4,28
+17,42
+15,54
+38,40
+60,27
+35,54
+20,60
+31,4
+55,64
+14,44
+34,46
+44,54
+44,27
+53,26
+49,24
+34,40
+67,0
+10,4
+60,32
+50,66
+64,70
+48,5
+1,32
+6,4
+60,35
+49,14
+2,2
+45,38
+60,34
+0,50
+20,62
+61,20
+34,57
+38,29
+24,12
+12,6
+54,1
+48,61
+26,35
+14,40
+16,48
+46,62
+25,12
+42,70
+17,4
+14,36
+22,10
+6,14
+61,52
+28,50
+8,8
+70,59
+44,46
+56,54
+29,60
+51,46
+43,12
+34,38
+32,8
+8,32
+27,38
+21,18
+30,29
+60,66
+48,70
+48,4
+68,7
+61,16
+56,26
+33,42
+36,62
+66,60
+38,49
+55,32
+30,52
+46,41
+48,7
+68,36
+32,27
+57,24
+36,42
+56,47
+44,15
+38,23
+8,54
+16,62
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+65,34
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+50,0
+12,56
+26,50
+63,56
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+2,69
+28,34
+68,59
+23,64
+44,43
+34,66
+38,22
+42,56
+42,60
+14,15
+51,32
+37,16
+44,66
+32,21
+64,14
+63,18
+42,2
+21,22
+10,62
+46,18
+42,6
+24,38
+21,4
+35,32
+10,8
+66,50
+50,70
+52,40
+10,32
+46,33
+54,36
+66,36
+64,66
+48,18
+61,64
+61,70
+51,22
+22,56
+41,4
+0,63
+56,12
+17,2
+45,40
+26,38
+20,5
+31,70
+51,10
+32,17
+22,13
+65,60
+61,50
+17,8
+54,52
+50,36
+7,68
+18,67
+18,4
+53,66
+56,41
+40,40
+18,60
+60,33
+17,10
+48,62
+0,62
+31,14
+32,19
+68,11
+34,34
+26,19
+38,30
+46,10
+10,66
+64,51
+24,42
+32,25
+63,40
+50,45
+58,66
+44,3
+70,63
+29,0
+26,15
+29,30
+16,8
+42,7
+50,10
+0,5
+20,33
+60,42
+0,64
+24,5
+21,56
+52,22
+30,26
+30,44
+52,44
+48,66
+64,60
+70,58
+70,35
+62,67
+60,57
+70,5
+33,66
+0,21
+4,63
+29,44
+26,66
+48,0
+42,9
+9,50
+34,28
+51,62
+38,52
+20,64
+5,70
+16,14
+70,20
+65,44
+32,29
+69,38
+42,36
+6,3
+66,15
+31,32
+66,30
+6,28
+54,20
+65,20
+10,10
+15,10
+38,24
+8,6
+57,16
+55,36
+38,41
+16,36
+46,20
+12,57
+52,4
+24,45
+40,16
+64,25
+22,18
+23,50
+24,70
+27,14
+9,58
+14,34
+56,8
+20,18
+49,64
+48,20
+70,68
+70,17
+60,68
+70,26
+66,54
+66,8
+0,22
+36,38
+61,10
+10,46
+47,12
+0,53
+13,22
+51,64
+62,49
+38,70
+56,34
+32,42
+24,15
+58,46
+40,68
+21,28
+42,34
+70,56
+32,50
+44,64
+63,20
+8,64
+25,36
+28,23
+43,66
+18,39
+16,4
+26,54
+18,31
+44,2
+27,0
+21,42
+48,42
+62,13
+56,7
+62,20
+4,19
+52,13
+68,68
+27,32
+54,31
+62,47
+0,38
+2,0
+37,40
+31,64
+70,31
+42,8
+22,26
+13,12
+6,34
+23,38
+46,2
+56,52
+30,16
+36,24
+48,46
+21,38
+67,38
+64,36
+38,60
+47,52
+35,62
+55,0
+60,69
+21,2
+55,12
+19,2
+9,16
+47,42
+27,2
+68,16
+50,9
+62,53
+40,58
+41,46
+0,32
+47,2
+4,22
+32,53
+14,16
+15,46
+8,49
+32,48
+50,61
+29,18
+22,6
+66,6
+64,8
+42,48
+26,62
+35,48
+40,20
+18,44
+58,13
+68,45
+34,62
+31,56
+47,54
+52,31
+69,36
+21,66
+57,50
+45,54
+26,70
+48,43
+34,5
+12,63
+36,40
+24,36
+27,70
+64,15
+8,4
+23,58
+34,68
+28,16
+22,60
+14,29
+45,22
+39,58
+34,27
+40,22
+61,4
+16,68
+36,19
+36,30
+30,12
+54,34
\ No newline at end of file
diff --git a/inputs/18/test.txt b/inputs/18/test.txt
new file mode 100644
index 0000000..0371b23
--- /dev/null
+++ b/inputs/18/test.txt
@@ -0,0 +1,25 @@
+5,4
+4,2
+4,5
+3,0
+2,1
+6,3
+2,4
+1,5
+0,6
+3,3
+2,6
+5,1
+1,2
+5,5
+2,5
+6,5
+1,4
+0,4
+6,4
+1,1
+6,1
+1,0
+0,5
+1,6
+2,0
\ No newline at end of file
diff --git a/solutions/18.zig b/solutions/18.zig
new file mode 100644
index 0000000..a1cd766
--- /dev/null
+++ b/solutions/18.zig
@@ -0,0 +1,166 @@
+const std = @import("std");
+const print = std.debug.print;
+const util = @import("util.zig");
+const log = util.log;
+const Point = util.Point;
+const expect = std.testing.expect;
+
+// As of this day I started initializing the Allocator in `main` instead of `part_<whatever>` - the higher-level it is,
+// the less repetition and (more importantly) the more likely I'll be able to deallocate anything returned from
+// lower-level functions.
+//
+// Also while researching the previous day I realized how useful `catch unreachable` is for non-production-grade code
+// like this - silently-swallowing irrelevant errors like `OutOfMemory`.
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const response = try partOne(false, false, allocator);
+    print("{}\n", .{response});
+}
+
+fn partOne(is_test_case: bool, debug: bool, allocator: std.mem.Allocator) !u32 {
+    if (debug) {
+        print("DEBUG LOGGING IS ENABLED\n", .{});
+    }
+    const dimension: usize = if (is_test_case) 7 else 71;
+    const data_volume: usize = if (is_test_case) 12 else 1024;
+
+    const map = buildMap(dimension, allocator);
+    defer allocator.free(map);
+    defer {
+        for (map) |line| {
+            allocator.free(line);
+        }
+    }
+
+    const input_file = try util.getInputFile("18", is_test_case);
+    const data = try util.readAllInputWithAllocator(input_file, allocator);
+    defer allocator.free(data);
+
+    var data_lines_it = std.mem.splitScalar(u8, data, '\n');
+    var count: usize = 0;
+    while (data_lines_it.next()) |line| : (count += 1) {
+        const comma_index = std.mem.indexOf(u8, line, ",").?;
+        const x = std.fmt.parseInt(u8, line[0..comma_index], 10) catch unreachable;
+        const y = std.fmt.parseInt(u8, line[comma_index + 1 ..], 10) catch unreachable;
+        map[y][x] = '#';
+        if (count >= data_volume - 1) {
+            break;
+        }
+    }
+
+    // For debugging purposes
+    if (debug) {
+        print("Printing the map for your own visualization:\n", .{});
+        for (map) |line| {
+            for (line) |c| {
+                print("{c}", .{c});
+            }
+            print("\n", .{});
+        }
+    }
+
+    // Hello Dijkstra my old friend...
+    var visited = std.AutoHashMap(Point, void).init(allocator);
+    defer visited.deinit();
+
+    var distances = std.AutoHashMap(Point, u32).init(allocator);
+    defer distances.deinit();
+    distances.put(Point{ .x = 0, .y = 0 }, 0) catch unreachable;
+
+    var candidates = std.AutoHashMap(Point, void).init(allocator);
+    candidates.put(Point{ .x = 0, .y = 0 }, {}) catch unreachable;
+    defer candidates.deinit();
+
+    return while (true) {
+        var cand_it = candidates.keyIterator();
+        var current_point: Point = undefined;
+        var lowest_distance_found: u32 = std.math.maxInt(u32);
+        while (cand_it.next()) |cand| {
+            const actual_point = cand.*;
+            log("Considering {s} as the next current_point ", .{actual_point}, debug);
+            if (visited.contains(actual_point)) {
+                log("but rejecting it because it's been visited already\n", .{}, debug);
+                continue;
+            }
+
+            const distance_of_candidate = distances.get(actual_point) orelse std.math.maxInt(u32);
+            if (distance_of_candidate < lowest_distance_found) {
+                log("and it is a possibility!\n", .{}, debug);
+                current_point = actual_point;
+                lowest_distance_found = distance_of_candidate;
+            } else {
+                log("but rejecting it because it already has a shorter minimum-distance ({} vs. {})\n", .{ distance_of_candidate, lowest_distance_found }, debug);
+            }
+        }
+
+        log("Found point {s} as current_point - it has distance {}\n", .{ current_point, lowest_distance_found }, debug);
+        if (lowest_distance_found == std.math.maxInt(u32)) {
+            print("ERROR - iterated over all candidates, but found none with non-infinite distance\n", .{});
+        }
+
+        // Check for termination condition
+        if (current_point.x == dimension - 1 and current_point.y == dimension - 1) {
+            break lowest_distance_found;
+        }
+
+        // Haven't terminated => we're still on a non-target node. Check neighbours, and update their min-distance.
+
+        const distance_of_neighbour_from_current_point = lowest_distance_found + 1;
+        const neighbours = current_point.neighbours(dimension, dimension, allocator);
+        for (neighbours) |neighbour| {
+            if (visited.contains(neighbour)) {
+                log("Not processing {s} because it's already been visited\n", .{neighbour}, debug);
+                continue;
+            }
+
+            if (map[neighbour.y][neighbour.x] == '.') {
+                const distance_response = distances.getOrPut(neighbour) catch unreachable;
+                if (!distance_response.found_existing) {
+                    log("Adding a new (first) distance to {s} (via {s}) - {}\n", .{ neighbour, current_point, distance_of_neighbour_from_current_point }, debug);
+                    distance_response.value_ptr.* = distance_of_neighbour_from_current_point;
+                } else {
+                    if (distance_response.value_ptr.* > distance_of_neighbour_from_current_point) {
+                        log("Overriding distance for neighbour {s} because distance of path from {s} ({}) is less than current value ({})\n", .{ neighbour, current_point, distance_of_neighbour_from_current_point, distance_response.value_ptr.* }, debug);
+                        distance_response.value_ptr.* = distance_of_neighbour_from_current_point;
+                    }
+                }
+                log("Adding {s} to candidates\n", .{neighbour}, debug);
+                candidates.put(neighbour, {}) catch unreachable;
+            } else {
+                log("Not processing neighbour {s} because it is blocked off\n", .{neighbour}, debug);
+            }
+        }
+        allocator.free(neighbours);
+
+        // Update sets for next iteration
+        visited.put(current_point, {}) catch unreachable;
+        // Not strictly necessary, as we already check for visited whenever iterating over candidates - but this will
+        // prevent some unnecessary double-processing.
+        _ = candidates.remove(current_point);
+    };
+}
+
+fn buildMap(dimension: usize, allocator: std.mem.Allocator) [][]u8 {
+    var map_list = std.ArrayList([]u8).init(allocator);
+    for (0..dimension) |_| {
+        var line = std.ArrayList(u8).init(allocator);
+        for (0..dimension) |_| {
+            line.append('.') catch unreachable;
+        }
+        map_list.append(line.toOwnedSlice() catch unreachable) catch unreachable;
+    }
+    return map_list.toOwnedSlice() catch unreachable;
+}
+
+test "partOne" {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const response = try partOne(true, true, allocator);
+    print("Response is {}\n", .{response});
+    try expect(response == 22);
+}
diff --git a/solutions/util.zig b/solutions/util.zig
index 141aa37..93fd5d2 100644
--- a/solutions/util.zig
+++ b/solutions/util.zig
@@ -93,6 +93,45 @@ pub fn magnitude(num: i32) u32 {
     }
 }
 
+// These are used in so many of these types of puzzles - I should have just implemented them at the start, rather than
+// so late in the challenge (Day 18 :P )
+// (Though, in my defence, I didn't know what datatype would be appropriate, and I was quite a long way from being able
+// to confidently use generics in Zig at that point)
+pub const Point = struct {
+    x: usize,
+    y: usize,
+    pub fn neighbours(self: *Point, width: usize, height: usize, allocator: std.mem.Allocator) []Point {
+        var response = std.ArrayList(Point).init(allocator);
+        if (self.x > 0) {
+            response.append(Point{ .x = self.x - 1, .y = self.y }) catch unreachable;
+        }
+        if (self.y > 0) {
+            response.append(Point{ .x = self.x, .y = self.y - 1 }) catch unreachable;
+        }
+        if (self.x < width - 1) {
+            response.append(Point{ .x = self.x + 1, .y = self.y }) catch unreachable;
+        }
+        if (self.y < height - 1) {
+            response.append(Point{ .x = self.x, .y = self.y + 1 }) catch unreachable;
+        }
+
+        return response.toOwnedSlice() catch unreachable;
+    }
+
+    pub fn format(self: Point, comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype) !void {
+        _ = fmt;
+        _ = options;
+
+        try writer.print("[{},{}]", .{ self.x, self.y });
+    }
+};
+
+pub fn log(comptime message: []const u8, args: anytype, debug: bool) void {
+    if (debug) {
+        std.debug.print(message, args);
+    }
+}
+
 const expect = @import("std").testing.expect;
 
 test {