diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4e39aa0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# Advent of Code 2025
+
+| Day | Part 1 | Part 2 |
+| --- | ------ | ------ |
+|   1 |    [x] |    [x] |
+|   2 |    [x] |    [x] |
+|   3 |    [x] |    [x] |
+|   4 |    [x] |    [x] |
+|   5 |    [x] |    [x] |
+|   6 |    [x] |    [x] |
+|   7 |    [x] |    [x] |
+|   8 |    [ ] |    [ ] |
+|   9 |    [x] |    [x] |
+|  10 |    [x] |    [ ] |
+|  11 |    [x] |    [x] |
+|  12 |    [ ] |    [ ] |
diff --git a/flake.nix b/flake.nix
index e668d05..6649f39 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,6 +17,7 @@
         nativeBuildInputs = with pkgs; [
           zig
           zls
+          hyperfine
         ];
 
         buildInputs = with pkgs; [];
diff --git a/src/days/day08.zig b/src/days/day08.zig
index 87a7c79..20383ea 100644
--- a/src/days/day08.zig
+++ b/src/days/day08.zig
@@ -1,165 +1,7 @@
 const std = @import("std");
 
-pub const title = "Day 08: Playground";
+pub const title = "Day 08";
 
-pub fn run(allocator: std.mem.Allocator) !void {
-    //const input = @embedFile("./input/day08.txt");
-    const input =
-        \\162,817,812
-        \\57,618,57
-        \\906,360,560
-        \\592,479,940
-        \\352,342,300
-        \\466,668,158
-        \\542,29,236
-        \\431,825,988
-        \\739,650,466
-        \\52,470,668
-        \\216,146,977
-        \\819,987,18
-        \\117,168,530
-        \\805,96,715
-        \\346,949,466
-        \\970,615,88
-        \\941,993,340
-        \\862,61,35
-        \\984,92,344
-        \\425,690,689
-        ;
-
-    var lines = std.mem.tokenizeScalar(u8, input, '\n');
-
-    var junction_boxes: std.ArrayList(JunctionBox) = .empty;
-    defer junction_boxes.deinit(allocator);
-
-    var junction_box_index: usize = 0;
-    while (lines.next()) |line| {
-        defer junction_box_index += 1;
-
-        var coordinates = std.mem.tokenizeScalar(u8, line, ',');
-        const x = blk: {
-            const s = coordinates.next() orelse continue;
-            break :blk try std.fmt.parseUnsigned(u32, s, 10);
-        };
-        const y = blk: {
-            const s = coordinates.next() orelse continue;
-            break :blk try std.fmt.parseUnsigned(u32, s, 10);
-        };
-        const z = blk: {
-            const s = coordinates.next() orelse continue;
-            break :blk try std.fmt.parseUnsigned(u32, s, 10);
-        };
-        const junction_box = JunctionBox{
-            .index = junction_box_index,
-            .position = .{ .v = .{ x, y, z } },
-        };
-        std.debug.print("{f}\n", .{junction_box});
-
-        try junction_boxes.append(allocator, junction_box);
-    }
-
-    var possible_connections: std.ArrayList(Connection) = .empty;
-    defer possible_connections.deinit(allocator);
-    var connection_index: usize = 0;
-    for (junction_boxes.items, 0..) |junction_box, i| {
-        for (junction_boxes.items[i + 1..]) |other_junction_box| {
-            defer connection_index += 1;
-
-            const length = junction_box.position.distance(other_junction_box.position);
-            const connection = Connection{
-                .index = connection_index,
-                .from = junction_box,
-                .to = other_junction_box,
-                .length = length,
-            };
-            std.debug.print("{f}\n", .{connection});
-
-            try possible_connections.append(allocator, connection);
-        }
-    }
-
-    std.mem.sort(Connection, possible_connections.items, {}, struct {
-        fn f(_: void, lhs: Connection, rhs: Connection) bool {
-            return lhs.length < rhs.length;
-        }
-    }.f);
-
-    var network_id: usize = 0;
-    for (possible_connections.items, 0..) |*connection, i| {
-        var connection_network_id = network_id;
-        for (possible_connections.items) |other_connection| {
-            if (connection.index == other_connection.index) {
-                continue;
-            }
-            if (other_connection.network == null) {
-                continue;
-            }
-            if (connection.connected(other_connection)) {
-                connection_network_id = other_connection.network.?;
-            }
-        }
-
-        connection.network = connection_network_id;
-        if (connection_network_id == network_id) {
-            network_id += 1;
-        }
-
-        std.debug.print("{f}\n", .{connection});
-
-        if (i >= 10) {
-            break;
-        }
-    }
+pub fn run(_: std.mem.Allocator) !void {
 }
 
-const Connection = struct {
-    index: usize,
-    from: JunctionBox,
-    to: JunctionBox,
-    length: u32,
-    network: ?usize = null,
-
-    const Self = @This();
-
-    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
-        try w.print("({d}) {d} to {d}, length = {d}, network = {?d}", .{self.index, self.from.index, self.to.index, self.length, self.network});
-    }
-
-    pub fn connected(self: Self, other: Self) bool {
-        if (self.from.index == other.from.index) return true;
-        if (self.to.index == other.from.index) return true;
-        if (self.from.index == other.to.index) return true;
-        if (self.to.index == other.to.index) return true;
-        return false;
-    }
-};
-
-const JunctionBox = struct {
-    index: usize,
-    position: Position,
-
-    const Self = @This();
-
-    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
-        try w.print("({d}) {f}", .{self.index, self.position});
-    }
-};
-
-const Position = struct {
-    v: @Vector(3, u32),
-
-    const Self = @This();
-
-    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
-        try w.print("{d}, {d}, {d}", .{self.v[0], self.v[1], self.v[2]});
-    }
-
-    pub fn distance(self: Self, other: Self) u32 {
-        const comp = self.v < other.v;
-        const low = @select(u32, comp, self.v, other.v);
-        const high = @select(u32, !comp, self.v, other.v);
-        const diff = high - low;
-        return std.math.sqrt(@reduce(.Add, diff * diff));
-    }
-};
-
diff --git a/src/days/day09.zig b/src/days/day09.zig
index 5b8cfab..c167255 100644
--- a/src/days/day09.zig
+++ b/src/days/day09.zig
@@ -1,7 +1,242 @@
 const std = @import("std");
 
-pub const title = "Day 09";
+pub const title = "Day 09: Movie Theater";
 
-pub fn run(_: std.mem.Allocator) !void {
+pub fn run(allocator: std.mem.Allocator) !void {
+    const input = @embedFile("./input/day09.txt");
+    //const input =
+    //    \\7,1
+    //    \\11,1
+    //    \\11,7
+    //    \\9,7
+    //    \\9,5
+    //    \\2,5
+    //    \\2,3
+    //    \\7,3
+    //    ;
+
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var tiles: std.ArrayList(Tile) = .empty;
+    defer tiles.deinit(allocator);
+
+    std.debug.print("parsing tiles...\n", .{});
+    var index: usize = 0;
+    while (lines.next()) |line| {
+        defer index += 1;
+        var coordinates = std.mem.tokenizeScalar(u8, line, ',');
+        const x = blk: {
+            const s = coordinates.next() orelse continue;
+            break :blk try std.fmt.parseUnsigned(u64, s, 10);
+        };
+        const y = blk: {
+            const s = coordinates.next() orelse continue;
+            break :blk try std.fmt.parseUnsigned(u64, s, 10);
+        };
+        try tiles.append(allocator, .{ .index = index, .pos = .{ x, y } });
+    }
+
+    std.debug.print("calculating edges...\n", .{});
+    var edges: std.ArrayList(Edge) = .empty;
+    defer edges.deinit(allocator);
+    for (tiles.items, 0..) |tile, i| {
+        const a = tile;
+        const b = if (i == tiles.items.len - 1) tiles.items[0] else tiles.items[i + 1];
+        try edges.append(allocator, Edge.fromTiles(a, b));
+    }
+
+    std.debug.print("finding largest rectangle...\n", .{});
+    var largest_area: usize = 0;
+    var largest_rectangle: Rectangle = undefined;
+    for (tiles.items, 0..) |first_tile, i| {
+        inner: for (tiles.items[i + 1..]) |second_tile| {
+            const rectangle = first_tile.rectangle(second_tile);
+
+            std.debug.print("checking rectangle {f}...\n", .{rectangle});
+
+            const has_inside = rectangle.width() >= 3 and rectangle.height() >= 3;
+            if (has_inside) {
+                const one: @Vector(2, u64) = @splat(1);
+                const top_left = rectangle.topLeft() + one;
+                const bottom_right = rectangle.bottomRight() - one;
+                edge_loop: for (edges.items) |edge| {
+                    if (edge.direction == .horizontal) {
+                        if (edge.a.pos[1] < top_left[1] or edge.a.pos[1] > bottom_right[1]) {
+                            continue :edge_loop;
+                        }
+
+                        const start, const end = if (edge.a.pos[0] < edge.b.pos[0] + 1) .{ edge.a.pos[0], edge.b.pos[0] } else .{ edge.b.pos[0], edge.a.pos[0] + 1 };
+                        for (start..end) |ex| {
+                            const edge_tile: @Vector(2, u64) = .{ ex, edge.a.pos[1] };
+                            if (top_left[0] <= edge_tile[0] and edge_tile[0] <= bottom_right[0]) {
+                                std.debug.print("rectangle {f} hits edge {f}\n", .{rectangle, edge});
+                                continue :inner;
+                            }
+                        }
+                    } else {
+                        if (edge.a.pos[0] < top_left[0] or edge.a.pos[0] > bottom_right[0]) {
+                            continue :edge_loop;
+                        }
+
+                        const start, const end = if (edge.a.pos[1] < edge.b.pos[1] + 1) .{ edge.a.pos[1], edge.b.pos[1] } else .{ edge.b.pos[1], edge.a.pos[1] + 1 };
+                        for (start..end) |ey| {
+                            const edge_tile: @Vector(2, u64) = .{ edge.a.pos[0], ey };
+                            if (top_left[1] <= edge_tile[1] and edge_tile[1] <= bottom_right[1]) {
+                                std.debug.print("rectangle {f} hits edge {f}\n", .{rectangle, edge});
+                                continue :inner;
+                            }
+                        }
+                    }
+                }
+            }
+
+            const area = rectangle.area();
+            if (area > largest_area) {
+                largest_area = area;
+                largest_rectangle = rectangle;
+            }
+        }
+    }
+
+    std.debug.print("rectangle = {f}\n", .{largest_rectangle});
+    std.debug.print("top_left = {any}, bottom_right = {any}\n", .{largest_rectangle.topLeft(), largest_rectangle.bottomRight()});
+
+    var buffer: [64]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("{d}\n", .{largest_area});
+
+    try stdout.flush();
 }
 
+const Tile = struct {
+    index: usize,
+    pos: @Vector(2, u64),
+
+    const Self = @This();
+
+    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
+        try w.print("{d},{d}", .{self.pos[0], self.pos[1]});
+    }
+
+    pub fn rectangle(self: Self, other_corner: Self) Rectangle {
+        return Rectangle.fromTiles(self, other_corner);
+    }
+};
+
+const Edge = struct {
+    a: Tile,
+    b: Tile,
+
+    direction: Direction,
+
+    const Self = @This();
+
+    const Direction = enum {
+        horizontal,
+        vertical,
+    };
+
+    pub fn fromTiles(a: Tile, b: Tile) Self {
+        const direction: Direction = if (a.pos[0] == b.pos[0])
+            .vertical
+        else if (a.pos[1] == b.pos[1])
+            .horizontal
+        else
+            unreachable;
+
+        return .{
+            .a = a,
+            .b = b,
+            .direction = direction,
+        };
+    }
+
+    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
+        try w.print("{f} - {f}", .{self.a, self.b});
+    }
+};
+
+/// 0,0    1,0
+///  a ---- c
+///  |      |
+///  |      |
+///  d ---- b
+/// 0,1    1,1
+const Rectangle = struct {
+    a: Tile,
+    b: Tile,
+
+    c: @Vector(2, u64),
+    d: @Vector(2, u64),
+
+    const Self = @This();
+
+    pub fn fromTiles(a: Tile, b: Tile) Self {
+        const cx = if (a.pos[0] <= b.pos[0]) b.pos[0] else a.pos[0];
+        const cy = if (a.pos[1] >= b.pos[1]) a.pos[1] else b.pos[1];
+        const dx = if (a.pos[0] <= b.pos[0]) a.pos[0] else b.pos[0];
+        const dy = if (a.pos[1] >= b.pos[1]) b.pos[1] else a.pos[1];
+        return .{
+            .a = a,
+            .b = b,
+            .c = .{ cx, cy },
+            .d = .{ dx, dy },
+        };
+    }
+
+    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
+        try w.print("{d} to {d} ({f} - {d},{d} - {f} - {d},{d})", .{self.a.index, self.b.index, self.a, self.c[0], self.c[1], self.b, self.d[0], self.d[1]});
+    }
+
+    pub fn topLeft(self: Self) @Vector(2, u64) {
+        const verts = [_]@Vector(2, u64){ self.c, self.b.pos, self.d };
+        var top_left: @Vector(2, u64) = self.a.pos;
+        for (verts) |vert| {
+            const cond = vert <= top_left;
+            if (@reduce(.And, cond)) {
+                top_left = vert;
+            }
+        }
+        return top_left;
+    }
+
+    pub fn bottomRight(self: Self) @Vector(2, u64) {
+        const verts = [_]@Vector(2, u64){ self.d, self.a.pos, self.c };
+        var bottom_right: @Vector(2, u64) = self.b.pos;
+        for (verts) |vert| {
+            const cond = vert >= bottom_right;
+            if (@reduce(.And, cond)) {
+                bottom_right = vert;
+            }
+        }
+        return bottom_right;
+    }
+
+    pub fn width(self: Self) u64 {
+        const cond = self.a.pos > self.b.pos;
+        const high = @select(u64, cond, self.a.pos, self.b.pos);
+        const low = @select(u64, !cond, self.a.pos, self.b.pos);
+        const diff = high - low;
+        return diff[0] + 1;
+    }
+
+    pub fn height(self: Self) u64 {
+        const cond = self.a.pos > self.b.pos;
+        const high = @select(u64, cond, self.a.pos, self.b.pos);
+        const low = @select(u64, !cond, self.a.pos, self.b.pos);
+        const diff = high - low;
+        return diff[1] + 1;
+    }
+
+    pub fn area(self: Self) u64 {
+        const cond = self.a.pos > self.b.pos;
+        const high = @select(u64, cond, self.a.pos, self.b.pos);
+        const low = @select(u64, !cond, self.a.pos, self.b.pos);
+        const diff = high - low;
+        const one: @Vector(2, u64) = @splat(1);
+        return @reduce(.Mul, diff + one);
+    }
+};
+
diff --git a/src/days/day11.zig b/src/days/day11.zig
index d16d9d5..5e7686a 100644
--- a/src/days/day11.zig
+++ b/src/days/day11.zig
@@ -1,7 +1,120 @@
 const std = @import("std");
 
-pub const title = "Day 11";
+pub const title = "Day 11: Reactor";
 
-pub fn run(_: std.mem.Allocator) !void {
+pub fn run(allocator: std.mem.Allocator) !void {
+    const input = @embedFile("./input/day11.txt");
+    //const input =
+    //    \\aaa: you hhh
+    //    \\you: bbb ccc
+    //    \\bbb: ddd eee
+    //    \\ccc: ddd eee fff
+    //    \\ddd: ggg
+    //    \\eee: out
+    //    \\fff: out
+    //    \\ggg: out
+    //    \\hhh: ccc fff iii
+    //    \\iii: out
+    //    ;
+    //const input =
+    //    \\svr: aaa bbb
+    //    \\aaa: fft
+    //    \\fft: ccc
+    //    \\bbb: tty
+    //    \\tty: ccc
+    //    \\ccc: ddd eee
+    //    \\ddd: hub
+    //    \\hub: fff
+    //    \\eee: dac
+    //    \\dac: fff
+    //    \\fff: ggg hhh
+    //    \\ggg: out
+    //    \\hhh: out
+    //    ;
+
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var devices: std.StringHashMap([][]const u8) = .init(allocator);
+    defer {
+        var outputs_iter = devices.valueIterator();
+        while (outputs_iter.next()) |value| {
+            allocator.free(value.*);
+        }
+        devices.deinit();
+    }
+
+    while (lines.next()) |line| {
+        const device = line[0..3];
+        std.debug.print("device = {s}\n", .{device});
+
+        var outputs: std.ArrayList([]const u8) = .empty;
+        defer outputs.deinit(allocator);
+
+        var outputs_iter = std.mem.tokenizeScalar(u8, line[5..], ' ');
+        while (outputs_iter.next()) |output| {
+            try outputs.append(allocator, output);
+        }
+
+        const outputs_slice = try outputs.toOwnedSlice(allocator);
+        errdefer allocator.free(outputs_slice);
+
+        try devices.put(device, outputs_slice);
+    }
+
+    var cache: std.StringHashMap(usize) = .init(allocator);
+    defer cache.deinit();
+    try cache.ensureTotalCapacity(devices.count());
+
+    const dac_to_fft = try visitOutputs("dac", "fft", devices, &cache);
+    const svr_to_fft = try visitOutputs("svr", "fft", devices, &cache);
+    cache.clearRetainingCapacity();
+
+    const to_fft = if (dac_to_fft == 0) svr_to_fft else dac_to_fft;
+
+    const dac_start = if (dac_to_fft == 0) "fft" else "svr";
+    const end_start = if (dac_to_fft == 0) "dac" else "fft";
+
+    const to_dac = try visitOutputs(dac_start, "dac", devices, &cache);
+    cache.clearRetainingCapacity();
+
+    const to_end = try visitOutputs(end_start, "out", devices, &cache);
+
+    const result = to_fft * to_dac * to_end;
+
+    var buffer: [8]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("{d}\n", .{result});
+
+    try stdout.flush();
+}
+
+fn visitOutputs(
+    start: []const u8,
+    end: []const u8,
+    devices: std.StringHashMap([][]const u8),
+    cache: *std.StringHashMap(usize),
+) !usize {
+    if (cache.get(start)) |result| {
+        return result;
+    }
+
+    var paths: usize = 0;
+    const device = devices.get(start);
+    if (device) |outputs| {
+        for (outputs) |output| {
+            if (std.mem.eql(u8, output, end)) {
+                paths += 1;
+            } else {
+                paths += try visitOutputs(output, end, devices, cache);
+            }
+        }
+        try cache.put(start, paths);
+        return paths;
+    } else {
+        std.debug.print("device {s} not found\n", .{start});
+        return 0;
+    }
 }
 
diff --git a/src/days/day12.zig b/src/days/day12.zig
index e5f9176..354fe56 100644
--- a/src/days/day12.zig
+++ b/src/days/day12.zig
@@ -1,7 +1,240 @@
 const std = @import("std");
 
-pub const title = "Day 12";
+pub const title = "Day 12: Christmas Tree Farm";
 
-pub fn run(_: std.mem.Allocator) !void {
+pub fn run(allocator: std.mem.Allocator) !void {
+    const input = @embedFile("./input/day12.txt");
+    //const input =
+    //    \\0:
+    //    \\###
+    //    \\##.
+    //    \\##.
+    //    \\
+    //    \\1:
+    //    \\###
+    //    \\##.
+    //    \\.##
+    //    \\
+    //    \\2:
+    //    \\.##
+    //    \\###
+    //    \\##.
+    //    \\
+    //    \\3:
+    //    \\##.
+    //    \\###
+    //    \\##.
+    //    \\
+    //    \\4:
+    //    \\###
+    //    \\#..
+    //    \\###
+    //    \\
+    //    \\5:
+    //    \\###
+    //    \\.#.
+    //    \\###
+    //    \\
+    //    \\4x4: 0 0 0 0 2 0
+    //    \\12x5: 1 0 1 0 2 2
+    //    \\12x5: 1 0 1 0 3 2
+    //    ;
+
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var presents: std.ArrayList(Present) = .empty;
+    defer presents.deinit(allocator);
+
+    var regions: std.ArrayList(Region) = .empty;
+    defer {
+        for (regions.items) |region| {
+            region.deinit(allocator);
+        }
+        regions.deinit(allocator);
+    }
+
+    while (lines.next()) |line| {
+        var semicolon_pos: usize = 0;
+        var x_pos: ?usize = null;
+        for (line, 0..) |c, i| {
+            switch (c) {
+                'x' => x_pos = i,
+                ':' => {
+                    semicolon_pos = i;
+                    break;
+                },
+                else => {},
+            }
+        }
+        if (semicolon_pos != 0) {
+            if (x_pos) |p| {
+                // region
+                const width = try std.fmt.parseUnsigned(usize, line[0..p], 10);
+                const height = try std.fmt.parseUnsigned(usize, line[p + 1..semicolon_pos], 10);
+
+                var required_presents: std.ArrayList(u8) = .empty;
+                defer required_presents.deinit(allocator);
+                if (presents.items.len > 0) {
+                    try required_presents.ensureTotalCapacity(allocator, presents.items.len);
+                }
+
+                var presents_iter = std.mem.tokenizeScalar(u8, line[semicolon_pos + 2..], ' ');
+                while (presents_iter.next()) |present| {
+                    const amount = try std.fmt.parseUnsigned(u8, present, 10);
+                    try required_presents.append(allocator, amount);
+                }
+
+                const required_presents_slice = try required_presents.toOwnedSlice(allocator);
+                errdefer allocator.free(required_presents_slice);
+
+                const region: Region = .{
+                    .width = width,
+                    .height = height,
+                    .required_presents = required_presents_slice,
+                };
+                try regions.append(allocator, region);
+            } else {
+                // present
+                var present: Present = .{
+                    .shape = .initEmpty(),
+                };
+                for (0..Present.Width) |y| {
+                    const l = lines.next() orelse unreachable;
+                    for (0..Present.Width) |x| {
+                        if (l[x] == '#') {
+                            present.set(x, y);
+                        }
+                    }
+                }
+                try presents.append(allocator, present);
+            }
+        }
+    }
+
+    var accumulator: usize = 0;
+
+    for (regions.items) |region| {
+        std.debug.print("{f}\n", .{region});
+        var area_needed: usize = 0;
+        for (region.required_presents, 0..) |amount, i| {
+            area_needed += amount * presents.items[i].area();
+        }
+        if (area_needed < region.area()) {
+            std.debug.print("{f}\nfits\n", .{region});
+            accumulator += 1;
+        }
+    }
+
+    var buffer: [8]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("{d}\n", .{accumulator});
+
+    try stdout.flush();
 }
 
+const Present = struct {
+    shape: std.bit_set.IntegerBitSet(Width * Width),
+
+    const Width = 3;
+
+    const Self = @This();
+
+    pub fn format(self: Self, w: *std.Io.Writer) std.Io.Writer.Error!void {
+        for (0..Width) |y| {
+            for (0..Width) |x| {
+                try w.writeByte(if (self.isSet(x, y)) '#' else '.');
+            }
+            if (y < Width - 1) {
+                try w.writeByte('\n');
+            }
+        }
+    }
+
+    pub fn set(self: *Self, x: usize, y: usize) void {
+        const index = (y * Width) + x;
+        self.shape.set(index);
+    }
+
+    pub fn isSet(self: Self, x: usize, y: usize) bool {
+        const index = (y * Width) + x;
+        return self.shape.isSet(index);
+    }
+
+    pub fn area(self: Self) usize {
+        return self.shape.count();
+    }
+};
+
+const Region = struct {
+    width: usize,
+    height: usize,
+    required_presents: []u8,
+
+    const Self = @This();
+
+    pub fn deinit(self: Self, allocator: std.mem.Allocator) void {
+        allocator.free(self.required_presents);
+    }
+
+    pub fn format(self: Self, w: *std.Io.Writer) std.Io.Writer.Error!void {
+        try w.print("{d}x{d}: ", .{self.width, self.height});
+        for (self.required_presents, 0..) |present, i| {
+            try w.print("{d}", .{present});
+            if (i < self.required_presents.len - 1) {
+                try w.writeByte(' ');
+            }
+        }
+    }
+
+    pub fn createEmpty(self: Self, allocator: std.mem.Allocator) !EmptyRegion {
+        return try .init(allocator, self.width, self.height);
+    }
+
+    pub fn area(self: Self) usize {
+        return self.width * self.height;
+    }
+};
+
+const EmptyRegion = struct {
+    grid: [][]bool,
+    filled_spaces: usize,
+
+    allocator: std.mem.Allocator,
+
+    const Self = @This();
+
+    pub fn init(allocator: std.mem.Allocator, width: u8, height: u8) !Self {
+        const h = try allocator.alloc([]bool, height);
+        for (0..height) |i| {
+            const w = try allocator.alloc(u8, width);
+            @memset(w, false);
+            h[i] = w;
+        }
+        return .{
+            .grid = h,
+            .filled_spaces = 0,
+            .allocator = allocator,
+        };
+    }
+
+    pub fn deinit(self: Self) void {
+        for (self.grid) |row| {
+            self.allocator.free(row);
+        }
+        self.allocator.free(self.grid);
+    }
+
+    pub fn fits(self: Self, present: Present) bool {
+        std.debug.assert(self.grid.len > 0);
+        const size = self.grid.len * self.grid[0].len;
+        if ((size - self.filled_spaces) < present.shape.count()) {
+            return false;
+        }
+
+        // TODO: Implementation
+        return false;
+    }
+};
+
diff --git a/src/days/input/day08.txt b/src/days/input/day08.txt
deleted file mode 100755
index 300a2da..0000000
--- a/src/days/input/day08.txt
+++ /dev/null
@@ -1,1000 +0,0 @@
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diff --git a/src/days/input/day09.txt b/src/days/input/day09.txt
new file mode 100755
index 0000000..44cac4b
--- /dev/null
+++ b/src/days/input/day09.txt
@@ -0,0 +1,496 @@
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diff --git a/src/days/input/day11.txt b/src/days/input/day11.txt
new file mode 100755
index 0000000..1c6713e
--- /dev/null
+++ b/src/days/input/day11.txt
@@ -0,0 +1,609 @@
+smx: otc
+mmh: gvp
+gbo: hyf alz
+laa: vky qjq
+vrn: tbs tsr jix
+xyl: xel eur wdj
+sxm: out
+wsd: kua hpv jep
+qsj: ulu xel eur wdj
+xwa: mtd xxf hnw
+kai: ehr kaj
+uuj: you
+owb: ixr bps pim eez ejn syt qrx hxw vsy ghl gfu cgh mpk kfj
+vky: owb wlw qic
+ysd: mkp jbf btz xgg gbk tvg iju amm dws ykz azc blh xld rpr uek rcl zzy jhu
+rbc: ski xyl sdx wpw
+zmc: pal lwb rns hex
+cuu: vyo
+bqf: kmy exx ish
+jbv: ysa
+aog: ayv kwq
+fcq: qic xss owb
+hyg: out
+xoz: llx kra cqn bzn swe tdo vnz zos duw
+gnq: eya
+qmk: fcq lyd
+ggp: brz eya
+oit: yyy quh brz
+hjl: dtj lnc jps fyr
+sqg: xbz upq
+nil: diq
+xqa: jei ipw tkt
+ond: fft jko dqj pxe
+and: ahn izm esa
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+dta: ctq jbw whr smq
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+xgw: kep unr lju mtm
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+tbu: fft dqj pxe
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+lmw: hlu mhq
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+cqx: rod jnp
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diff --git a/src/days/input/day12.txt b/src/days/input/day12.txt
new file mode 100755
index 0000000..6b6eac1
--- /dev/null
+++ b/src/days/input/day12.txt
@@ -0,0 +1,1030 @@
+0:
+..#
+.##
+###
+
+1:
+###
+.##
+.##
+
+2:
+..#
+.##
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