diff --git a/2023/day2/input.txt b/2023/day2/input.txt
new file mode 100644
index 0000000..fb2ad66
--- /dev/null
+++ b/2023/day2/input.txt
@@ -0,0 +1,100 @@
+Game 1: 4 green, 7 blue; 2 blue, 4 red; 5 blue, 2 green, 2 red; 1 green, 3 red, 9 blue; 3 green, 9 blue; 7 green, 2 blue, 2 red
+Game 2: 1 blue, 2 red; 1 green, 2 blue, 1 red; 1 red, 5 green; 3 red, 2 blue, 8 green; 3 blue, 2 red, 4 green; 2 blue, 4 green, 3 red
+Game 3: 7 red, 7 blue, 9 green; 15 green, 4 red, 8 blue; 3 green, 12 blue, 6 red
+Game 4: 4 blue, 11 green, 6 red; 4 green, 2 red; 12 red, 1 blue, 3 green
+Game 5: 10 green, 4 blue, 9 red; 3 green, 15 blue, 11 red; 15 blue, 1 green, 2 red; 8 red, 8 blue, 5 green
+Game 6: 5 green, 19 red; 6 green, 13 red, 2 blue; 2 blue, 16 red, 4 green; 13 red, 9 blue, 5 green
+Game 7: 1 blue, 6 red, 6 green; 7 blue, 4 red; 6 green, 1 red, 11 blue; 3 green, 4 blue, 4 red; 6 green, 13 blue, 11 red
+Game 8: 8 green, 2 blue; 20 green, 1 red; 1 blue, 6 red, 6 green; 9 green
+Game 9: 5 red; 4 green, 3 red, 1 blue; 1 blue; 6 red, 1 blue, 9 green
+Game 10: 2 green, 3 red; 18 blue, 20 green, 9 red; 7 red, 9 blue, 17 green
+Game 11: 15 green, 7 blue, 9 red; 7 blue, 10 green, 7 red; 5 red, 3 blue, 10 green; 5 blue, 12 green; 14 green, 8 blue, 5 red; 7 blue, 2 red, 5 green
+Game 12: 3 green, 1 red, 8 blue; 9 blue, 3 red, 3 green; 4 blue, 1 green; 2 red, 3 green, 1 blue; 4 red, 7 blue, 3 green
+Game 13: 14 green, 1 red; 4 green; 2 green, 1 blue; 14 green; 13 green, 1 red, 1 blue; 1 blue, 1 red, 5 green
+Game 14: 1 blue, 6 red, 13 green; 5 red, 10 blue, 3 green; 19 green, 1 red, 14 blue; 4 red, 17 green, 9 blue; 12 green, 10 blue, 7 red
+Game 15: 10 red, 2 blue, 18 green; 17 green, 3 blue, 7 red; 18 blue, 8 red, 12 green; 6 blue, 6 green, 12 red
+Game 16: 14 blue, 5 green, 12 red; 7 green, 3 red, 9 blue; 4 green, 1 red, 8 blue; 9 red, 19 green, 12 blue; 12 blue, 7 red, 6 green; 5 blue, 3 green, 6 red
+Game 17: 1 green, 1 blue, 15 red; 1 blue, 3 green, 12 red; 9 blue, 2 green, 10 red
+Game 18: 12 red, 7 green, 7 blue; 3 blue, 8 red, 1 green; 2 green, 17 red
+Game 19: 1 red, 7 blue, 17 green; 11 red, 15 blue; 11 blue, 18 green; 6 blue, 14 green, 14 red; 16 blue, 8 red, 8 green; 17 green, 9 red, 1 blue
+Game 20: 11 green; 1 blue, 4 green, 7 red; 7 green; 3 red, 1 blue, 6 green
+Game 21: 18 blue, 6 green, 10 red; 12 blue; 9 blue, 2 green, 9 red; 9 red, 20 blue, 1 green; 8 blue, 6 red; 19 blue, 1 green, 4 red
+Game 22: 4 blue, 16 red, 3 green; 7 blue, 3 green, 12 red; 10 red, 7 green, 10 blue; 7 red, 11 blue, 4 green; 3 blue, 1 green, 16 red
+Game 23: 5 green, 8 red, 1 blue; 2 red, 5 blue, 3 green; 2 green, 17 blue, 4 red; 2 blue, 2 red; 7 red, 1 green, 14 blue; 4 red, 8 blue
+Game 24: 1 blue, 3 green, 1 red; 3 blue, 11 green, 15 red; 3 blue, 2 red, 12 green; 9 green, 6 red, 2 blue; 15 green, 12 red, 3 blue; 13 green, 1 blue, 13 red
+Game 25: 6 blue, 5 red, 10 green; 9 red, 3 blue, 3 green; 6 blue, 11 red, 15 green; 7 green, 10 red, 4 blue; 2 red, 20 blue, 11 green
+Game 26: 3 blue, 5 red, 10 green; 7 green, 6 red; 7 green, 1 red, 3 blue; 10 green, 4 red, 3 blue; 4 red, 7 green, 3 blue; 8 green, 4 red
+Game 27: 16 green, 6 blue, 4 red; 3 red, 6 blue, 7 green; 10 green; 6 green, 1 red
+Game 28: 5 green, 5 red, 2 blue; 1 blue, 9 red, 6 green; 2 blue, 3 red; 1 blue, 1 green, 5 red; 4 green, 3 red; 9 green, 1 blue, 14 red
+Game 29: 1 red, 2 green, 13 blue; 1 green, 2 red, 9 blue; 12 red; 3 blue, 5 red
+Game 30: 8 blue, 3 red, 9 green; 10 green, 9 blue; 9 green, 12 blue; 3 blue, 2 red, 4 green; 8 blue, 9 green; 1 red, 12 blue, 6 green
+Game 31: 8 red, 16 blue; 2 red, 1 green, 1 blue; 5 red, 8 blue, 1 green
+Game 32: 3 green, 5 blue, 8 red; 10 blue, 1 red, 3 green; 9 green, 3 blue, 2 red; 2 blue, 1 red, 14 green; 3 blue, 10 red, 16 green
+Game 33: 1 red, 3 green, 2 blue; 15 blue, 1 green; 1 green, 1 red, 10 blue
+Game 34: 4 green, 7 blue; 2 blue, 12 green; 6 red, 14 green, 7 blue
+Game 35: 9 blue, 1 green; 2 green, 6 blue, 11 red; 1 green, 10 red, 1 blue
+Game 36: 5 blue, 1 green, 2 red; 11 blue, 3 green, 5 red; 2 green, 14 blue, 2 red; 3 green, 5 blue, 5 red; 13 blue, 2 green, 5 red; 3 green
+Game 37: 4 blue, 2 red, 8 green; 1 blue, 9 green, 4 red; 1 red, 4 green, 1 blue; 16 green, 3 blue, 4 red
+Game 38: 9 blue, 9 green; 1 green, 3 blue; 8 blue, 6 red, 5 green; 1 green, 9 red, 1 blue
+Game 39: 1 red, 17 green; 1 blue, 7 green, 7 red; 6 red, 4 blue
+Game 40: 1 blue, 2 red; 10 blue, 4 green, 2 red; 1 green, 11 blue, 3 red; 4 blue, 2 green; 3 blue, 4 red
+Game 41: 7 red, 4 blue, 4 green; 10 red, 11 blue, 1 green; 6 red, 6 blue, 4 green; 13 blue, 3 red, 7 green; 9 green, 12 blue, 14 red; 9 blue, 12 red, 10 green
+Game 42: 3 blue, 1 red, 11 green; 4 blue, 9 green, 8 red; 3 red, 5 blue, 1 green
+Game 43: 2 green, 17 blue, 9 red; 16 red, 12 blue, 2 green; 12 red, 12 blue, 7 green; 17 red, 16 blue, 7 green
+Game 44: 2 red, 3 green, 5 blue; 5 red, 5 blue, 7 green; 2 red, 5 blue, 5 green; 6 red, 5 blue, 2 green
+Game 45: 9 green, 1 blue; 1 red, 5 green, 2 blue; 2 blue, 4 green, 9 red; 13 green, 7 red, 1 blue; 3 blue, 4 green
+Game 46: 5 green, 7 red; 8 green, 5 blue, 1 red; 1 blue, 7 red, 17 green
+Game 47: 1 green, 17 blue; 9 blue, 1 green; 1 blue, 1 red
+Game 48: 1 red, 6 green, 7 blue; 9 green, 1 red, 2 blue; 10 blue, 6 green, 1 red; 1 red, 4 green, 9 blue; 6 blue, 3 green, 1 red
+Game 49: 1 red, 1 blue, 16 green; 3 red, 1 green; 16 green; 2 blue, 8 red, 19 green; 20 green, 9 red; 8 green, 6 red
+Game 50: 1 green, 2 blue; 2 red, 3 blue; 4 red, 2 blue; 1 green; 3 blue; 3 blue, 2 green, 1 red
+Game 51: 6 blue, 5 green; 6 red, 5 green; 6 green, 6 blue, 16 red; 10 red, 10 green, 1 blue
+Game 52: 4 red, 5 green, 1 blue; 15 green, 1 blue; 8 green, 5 blue, 5 red; 4 blue, 11 green, 1 red
+Game 53: 5 green, 3 blue, 5 red; 2 red, 4 blue, 1 green; 1 red, 2 green; 11 red
+Game 54: 7 green, 16 blue, 5 red; 5 green; 10 blue, 6 green, 5 red; 3 green
+Game 55: 3 green; 16 green, 1 blue; 13 green, 19 blue, 1 red; 13 green, 18 blue
+Game 56: 9 green; 3 blue, 1 red, 10 green; 1 red, 4 blue, 9 green
+Game 57: 14 blue, 2 red, 3 green; 1 red, 8 blue, 7 green; 1 green, 3 red, 15 blue; 5 green, 12 blue; 4 green, 15 blue
+Game 58: 9 red, 5 green; 10 green, 11 red, 1 blue; 12 green, 17 red, 1 blue; 1 blue, 1 green, 17 red; 14 red, 1 blue, 16 green
+Game 59: 2 red, 12 blue, 10 green; 6 green, 1 red, 14 blue; 14 blue, 9 green, 2 red; 12 green, 14 blue, 2 red
+Game 60: 5 blue, 8 green; 1 red, 6 green, 7 blue; 1 blue
+Game 61: 5 red, 2 blue, 5 green; 2 blue, 11 green; 1 blue, 2 red, 14 green; 3 green; 4 red, 13 green; 2 blue, 6 green, 1 red
+Game 62: 1 red, 1 blue, 2 green; 3 red, 1 blue, 2 green; 1 blue, 10 red; 6 red, 1 blue
+Game 63: 7 red, 6 blue, 4 green; 2 blue, 5 green, 8 red; 5 blue, 4 green, 10 red; 4 blue, 7 red, 10 green; 5 blue, 10 green, 8 red; 4 blue, 10 green, 3 red
+Game 64: 6 red, 7 green, 15 blue; 8 blue, 16 green, 3 red; 11 green, 12 blue; 4 red, 17 blue, 8 green
+Game 65: 2 blue, 7 green; 2 red, 8 blue; 2 green, 1 red, 5 blue; 1 green, 2 blue; 19 green, 7 blue; 2 red, 3 blue, 14 green
+Game 66: 15 green, 7 blue; 9 blue, 3 green, 16 red; 1 red, 1 blue, 16 green; 18 red, 8 blue, 11 green
+Game 67: 1 blue, 1 green, 2 red; 5 green, 8 red, 2 blue; 7 red, 1 blue
+Game 68: 3 blue, 10 red; 13 red, 1 green; 5 blue, 5 red; 2 blue, 1 green, 16 red; 16 red, 3 blue
+Game 69: 7 red, 1 blue, 3 green; 14 green, 2 blue; 3 green, 2 blue; 4 red, 1 green, 1 blue; 10 red, 14 green, 2 blue
+Game 70: 10 green, 12 red; 5 red, 7 green; 1 blue, 6 red, 11 green
+Game 71: 16 green, 13 red, 10 blue; 7 red, 7 blue, 15 green; 17 green, 13 red, 1 blue; 5 blue, 8 green, 11 red; 7 red, 1 blue, 15 green; 15 green, 4 blue, 2 red
+Game 72: 3 blue, 3 red; 2 blue, 3 red, 1 green; 1 red, 1 blue, 3 green; 1 green, 2 blue, 3 red; 3 blue, 1 green, 1 red; 1 blue, 4 red
+Game 73: 10 blue, 11 red, 5 green; 6 green, 9 blue, 4 red; 10 red, 5 green, 9 blue
+Game 74: 6 green, 17 blue; 1 red, 1 blue, 11 green; 2 blue, 1 red, 3 green
+Game 75: 11 red, 11 green, 3 blue; 11 red, 1 blue, 6 green; 4 green, 3 blue, 8 red
+Game 76: 3 green, 3 blue, 12 red; 3 blue, 15 green, 3 red; 4 red, 15 green, 2 blue
+Game 77: 13 blue, 11 red, 1 green; 3 red, 12 green, 12 blue; 7 red, 15 green, 4 blue; 5 red, 2 green, 3 blue
+Game 78: 4 red, 8 blue, 2 green; 7 blue, 3 green, 7 red; 3 green, 13 blue; 3 red, 4 green
+Game 79: 7 blue, 13 red, 8 green; 7 green, 15 red, 9 blue; 2 green, 8 red, 10 blue; 13 blue, 20 red, 7 green; 11 red, 2 green, 14 blue
+Game 80: 12 red; 2 blue, 15 red, 3 green; 1 blue, 1 green, 2 red; 1 green; 1 green, 3 blue, 13 red; 1 green, 2 blue, 1 red
+Game 81: 11 blue; 6 blue, 8 green, 4 red; 7 blue, 1 red, 1 green
+Game 82: 9 blue, 1 red; 3 blue, 1 red, 3 green; 8 blue, 8 green, 2 red; 5 blue
+Game 83: 7 blue, 13 red; 4 blue, 2 green, 3 red; 15 blue, 9 red, 1 green; 14 red, 1 green, 12 blue
+Game 84: 8 blue, 1 green, 20 red; 9 green, 20 red, 18 blue; 16 red, 15 blue, 5 green; 15 red, 10 green, 16 blue; 11 green, 14 red, 12 blue
+Game 85: 1 red, 2 blue, 9 green; 13 green, 3 blue, 5 red; 1 green, 1 red, 3 blue; 8 green, 2 blue, 1 red
+Game 86: 10 red, 6 blue, 11 green; 1 red, 11 green; 7 blue, 6 red, 11 green
+Game 87: 14 red, 4 blue, 4 green; 14 red, 4 blue, 7 green; 12 red, 11 green, 5 blue; 5 blue, 12 red
+Game 88: 3 green, 4 blue, 11 red; 3 green, 4 blue, 3 red; 10 red, 3 green; 3 blue, 2 red, 2 green
+Game 89: 4 blue, 2 red, 3 green; 3 green, 7 red, 13 blue; 1 green, 6 blue
+Game 90: 7 red; 5 blue, 11 red, 8 green; 8 red, 3 green, 2 blue
+Game 91: 2 blue; 4 red; 2 blue, 4 green; 3 green, 1 blue, 1 red
+Game 92: 7 blue, 10 green; 9 green, 9 blue, 7 red; 6 green; 12 red, 1 blue, 4 green; 5 red, 1 green, 13 blue
+Game 93: 7 green, 6 red, 1 blue; 3 red, 6 green, 8 blue; 1 blue, 6 green; 6 red, 15 blue, 4 green; 10 blue, 2 green, 6 red; 3 green, 5 red, 6 blue
+Game 94: 5 red, 1 green, 15 blue; 1 blue, 6 red; 2 red, 6 blue, 2 green
+Game 95: 9 blue, 4 red, 17 green; 15 green, 9 red, 10 blue; 1 blue, 13 green, 12 red
+Game 96: 1 blue, 12 green, 1 red; 3 blue, 1 green, 5 red; 2 blue, 8 red, 10 green
+Game 97: 18 blue, 7 red, 11 green; 6 red, 3 blue, 14 green; 1 red, 13 blue, 4 green
+Game 98: 5 blue, 2 green, 8 red; 12 red; 13 red, 4 blue, 4 green; 7 red, 11 blue; 10 blue, 2 green, 2 red; 6 red, 12 blue
+Game 99: 4 green, 2 blue, 4 red; 9 blue, 11 red, 1 green; 5 green
+Game 100: 2 blue, 12 green; 6 green, 1 red, 12 blue; 1 green, 5 blue, 1 red; 1 red, 12 green, 6 blue; 16 blue, 3 green
diff --git a/2023/day2/input.txt.h b/2023/day2/input.txt.h
new file mode 100644
index 0000000..5c401f0
--- /dev/null
+++ b/2023/day2/input.txt.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_2023_day2_input_txt_start __asm("_binary_2023_day2_input_txt_start");
+extern uint32_t _binary_2023_day2_input_txt_end __asm("_binary_2023_day2_input_txt_end");
+extern uint32_t _binary_2023_day2_input_txt_size __asm("_binary_2023_day2_input_txt_size");
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/2023/day2/sample1.txt b/2023/day2/sample1.txt
new file mode 100644
index 0000000..295c36d
--- /dev/null
+++ b/2023/day2/sample1.txt
@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
diff --git a/2023/day2/sample1.txt.h b/2023/day2/sample1.txt.h
new file mode 100644
index 0000000..212b6b1
--- /dev/null
+++ b/2023/day2/sample1.txt.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_2023_day2_sample1_txt_start __asm("_binary_2023_day2_sample1_txt_start");
+extern uint32_t _binary_2023_day2_sample1_txt_end __asm("_binary_2023_day2_sample1_txt_end");
+extern uint32_t _binary_2023_day2_sample1_txt_size __asm("_binary_2023_day2_sample1_txt_size");
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/2023/day2/solution.c b/2023/day2/solution.c
new file mode 100644
index 0000000..71749ce
--- /dev/null
+++ b/2023/day2/solution.c
@@ -0,0 +1,146 @@
+#include <stdint.h>
+
+#include "parse.h"
+#include "printf.h"
+
+enum cube_color {
+  red   = 0,
+  green = 1,
+  blue  = 2,
+};
+
+struct cube_set {
+  int color[3];
+};
+
+static const char * parse_color(const char * input, enum cube_color * color)
+{
+  const char * end;
+  if ((end = parse_match(input, "red"))) {
+    *color = red;
+  } else if ((end = parse_match(input, "blue"))) {
+    *color = blue;
+  } else if ((end = parse_match(input, "green"))) {
+    *color = green;
+  }
+  return end;
+}
+
+static const char * parse_cube(const char * input, int * value, enum cube_color * color)
+{
+  input = parse_skip(input, ' ');
+  input = parse_base10(input, value);
+  input = parse_skip(input, ' ');
+  input = parse_color(input, color);
+  return input;
+}
+
+static const char * parse_game(const char * input, int * number)
+{
+  input = parse_match(input, "Game ");
+  input = parse_base10(input, number);
+  input = parse_skip(input, ':');
+
+  return input;
+}
+
+static const char * parse_round(const char * input, struct cube_set * set)
+{
+  while (true) {
+    int value;
+    enum cube_color color;
+    input = parse_cube(input, &value, &color);
+    set->color[color] = value;
+    if (*input != ',')
+      break;
+    input++;
+  }
+  return input;
+}
+
+static void part1_set(const struct cube_set * set, void * data)
+{
+  bool * valid = data;
+  bool v = set->color[red] <= 12 && set->color[green] <= 13 && set->color[blue] <= 14;
+  *valid &= v;
+}
+
+static int part1_sum(int game_number, void * data)
+{
+  bool * valid = data;
+  int res = ((int)*valid) * game_number;
+  *valid = true;
+  return res;
+}
+
+static void part2_set(const struct cube_set * set, void * data)
+{
+  struct cube_set * max_set = data;
+  if (max_set->color[red] < set->color[red])
+    max_set->color[red] = set->color[red];
+  if (max_set->color[green] < set->color[green])
+    max_set->color[green] = set->color[green];
+  if (max_set->color[blue] < set->color[blue])
+    max_set->color[blue] = set->color[blue];
+}
+
+static int part2_sum(int game_number, void * data)
+{
+  struct cube_set * set = data;
+  int res = set->color[red] * set->color[green] * set->color[blue];
+  set->color[red] = 0; set->color[green] = 0; set->color[blue] = 0;
+  return res;
+}
+
+typedef void (* part_set_func)(const struct cube_set * set, void * data);
+typedef int (* part_sum_func)(int game_number, void * data);
+
+static int solve(const char * input, int length, part_set_func part_set, part_sum_func part_sum, void * data)
+{
+  const char * end = input + length;
+
+  int game_number;
+
+  int sum = 0;
+
+  while (input < end) {
+    input = parse_game(input, &game_number);
+
+    struct cube_set set;
+
+    while (true) {
+      set.color[red] = 0; set.color[green] = 0; set.color[blue] = 0;
+      input = parse_round(input, &set);
+
+      part_set(&set, data);
+
+      if (*input != ';')
+        break;
+      input++;
+    }
+
+    int next_sum = sum + part_sum(game_number, data);
+    if (next_sum < sum)
+      printf("overflow\n");
+    sum = next_sum;
+
+    input = parse_skip(input, '\n');
+  }
+
+  return sum;
+}
+
+int64_t _2023_day2_part1(const char * input, int length)
+{
+  bool valid = true;
+
+  return solve(input, length, part1_set, part1_sum, (void *)&valid);
+}
+
+int64_t _2023_day2_part2(const char * input, int length)
+{
+  struct cube_set set;
+  set.color[red] = 0; set.color[green] = 0; set.color[blue] = 0;
+
+  return solve(input, length, part2_set, part2_sum, (void *)&set);
+}
diff --git a/Makefile b/Makefile
index 70a2ae3..8bfe1b9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 all: $(patsubst %.cpp,%.elf,$(wildcard example/*.cpp))
 
-OPT = -O3
+OPT = -Og
 
 include dreamcast/base.mk
 include dreamcast/common.mk
diff --git a/input_dreamcast.inc b/input_dreamcast.inc
index 7027949..da796c0 100644
--- a/input_dreamcast.inc
+++ b/input_dreamcast.inc
@@ -1,6 +1,8 @@
 #include "2023/day1/sample1.txt.h"
 #include "2023/day1/sample2.txt.h"
 #include "2023/day1/input.txt.h"
+#include "2023/day2/sample1.txt.h"
+#include "2023/day2/input.txt.h"
 #include "2024/day1/sample1.txt.h"
 #include "2024/day1/input.txt.h"
 #include "2024/day2/sample1.txt.h"
@@ -35,6 +37,12 @@ static struct start_size sample[][2] = {
     { (  char *)&_binary_2023_day1_sample2_txt_start,
       (uint32_t)&_binary_2023_day1_sample2_txt_size   },
   },
+  {
+    { (  char *)&_binary_2023_day2_sample1_txt_start,
+      (uint32_t)&_binary_2023_day2_sample1_txt_size   },
+    { (  char *)&_binary_2023_day2_sample1_txt_start,
+      (uint32_t)&_binary_2023_day2_sample1_txt_size   },
+  },
   {
     { (  char *)&_binary_2024_day1_sample1_txt_start,
       (uint32_t)&_binary_2024_day1_sample1_txt_size   },
@@ -112,6 +120,8 @@ static struct start_size sample[][2] = {
 static struct start_size input[] = {
   { (  char *)&_binary_2023_day1_input_txt_start,
     (uint32_t)&_binary_2023_day1_input_txt_size   },
+  { (  char *)&_binary_2023_day2_input_txt_start,
+    (uint32_t)&_binary_2023_day2_input_txt_size   },
   { (  char *)&_binary_2024_day1_input_txt_start,
     (uint32_t)&_binary_2024_day1_input_txt_size   },
   { (  char *)&_binary_2024_day2_input_txt_start,
diff --git a/runner.c b/runner.c
index a98d6af..75bd4e5 100644
--- a/runner.c
+++ b/runner.c
@@ -38,7 +38,7 @@ bool runner_tick(struct runner_state * runner_state)
   int year = solution[ix].year;
   int day = solution[ix].day;
 
-  if (year != 2024 || day != 12) {
+  if (year != 2023 || day != 2) {
     return false;
   }
 
diff --git a/runner.inc b/runner.inc
index 010207a..e57abca 100644
--- a/runner.inc
+++ b/runner.inc
@@ -1,5 +1,7 @@
 int64_t _2023_day1_part1(const char * input, int length);
 int64_t _2023_day1_part2(const char * input, int length);
+int64_t _2023_day2_part1(const char * input, int length);
+int64_t _2023_day2_part2(const char * input, int length);
 int64_t _2024_day1_part1(const char * input, int length);
 int64_t _2024_day1_part2(const char * input, int length);
 int64_t _2024_day2_part1(const char * input, int length);
@@ -34,6 +36,11 @@ struct day_funcs solution[] = {
     {_2023_day1_part1, _2023_day1_part2},
     NULL,
   },
+  {
+    2023, 2,
+    {_2023_day2_part1, _2023_day2_part2},
+    NULL,
+  },
   {
     2024, 1,
     {_2024_day1_part1, _2024_day1_part2},
diff --git a/solutions.mk b/solutions.mk
index f9f150a..13e34a0 100644
--- a/solutions.mk
+++ b/solutions.mk
@@ -3,6 +3,9 @@ DAY_OBJ = \
 	2023/day1/sample2.txt.o \
 	2023/day1/input.txt.o \
 	2023/day1/solution.o \
+	2023/day2/sample1.txt.o \
+	2023/day2/input.txt.o \
+	2023/day2/solution.o \
 	2024/day1/sample1.txt.o \
 	2024/day1/input.txt.o \
 	2024/day1/solution.o \