diff --git a/2023/data/day2.txt b/2023/data/day2.txt
new file mode 100644
index 0000000..2473b41
--- /dev/null
+++ b/2023/data/day2.txt
@@ -0,0 +1,100 @@
+Game 1: 4 green, 3 blue, 11 red; 7 red, 5 green, 10 blue; 3 green, 8 blue, 8 red; 4 red, 12 blue; 15 red, 3 green, 10 blue
+Game 2: 3 red, 1 blue, 2 green; 1 blue, 9 green; 1 red, 10 green
+Game 3: 5 green, 9 red, 4 blue; 3 green, 7 blue; 12 blue, 3 green, 3 red; 3 blue, 7 red, 2 green; 7 blue, 3 green, 10 red
+Game 4: 2 green, 2 blue; 12 red, 9 green, 2 blue; 13 green, 15 red, 4 blue; 14 red, 3 green, 5 blue; 6 red, 1 green; 1 blue, 2 red, 2 green
+Game 5: 2 green, 6 blue; 1 red, 3 green, 5 blue; 3 green, 4 blue; 3 blue, 5 green, 1 red; 5 blue
+Game 6: 5 green, 1 blue, 3 red; 8 green, 15 red; 16 green, 5 red, 1 blue
+Game 7: 1 blue, 3 red, 11 green; 18 red, 16 blue, 5 green; 13 blue, 5 green; 1 red, 8 green, 15 blue
+Game 8: 1 green, 14 blue, 1 red; 10 blue; 1 green
+Game 9: 4 green, 12 blue, 1 red; 14 blue; 2 blue, 4 green; 4 green, 1 red, 10 blue
+Game 10: 11 green, 9 red; 12 red, 9 green; 5 red, 7 blue, 5 green; 6 green, 1 blue, 12 red; 3 red, 3 blue; 16 red, 9 blue, 7 green
+Game 11: 11 green, 1 red, 9 blue; 2 red, 13 green, 5 blue; 5 green, 2 red, 5 blue; 5 green, 7 blue; 1 red, 5 blue, 1 green
+Game 12: 5 green, 1 red; 1 red, 4 green; 1 blue, 12 green; 15 green, 4 blue; 4 blue, 19 green; 16 green, 4 blue
+Game 13: 1 red, 9 green, 5 blue; 10 blue, 7 green, 1 red; 3 green, 2 red, 14 blue; 16 blue, 3 red
+Game 14: 9 red, 1 blue, 2 green; 16 blue, 7 red; 2 green, 3 red, 14 blue; 1 green, 9 blue
+Game 15: 6 blue; 4 blue; 1 red, 16 blue, 3 green
+Game 16: 14 green, 5 red, 1 blue; 1 red, 1 blue; 5 blue
+Game 17: 1 blue, 1 green, 3 red; 2 red, 2 blue, 2 green; 1 blue, 1 red; 1 red, 2 green, 2 blue; 2 blue; 1 green, 2 red, 1 blue
+Game 18: 4 blue, 2 green, 1 red; 1 green, 1 red, 10 blue; 1 green, 1 red, 2 blue; 1 red, 5 blue; 3 green, 6 blue; 1 red, 1 green, 7 blue
+Game 19: 1 blue, 13 green, 12 red; 7 blue, 2 green, 1 red; 1 blue, 3 red, 3 green; 3 blue, 8 green, 10 red; 7 blue, 2 green
+Game 20: 1 red, 17 blue; 10 blue, 5 green; 9 green, 1 red, 3 blue; 1 red, 5 green, 1 blue
+Game 21: 3 red, 6 blue, 5 green; 4 blue, 1 red, 7 green; 6 blue, 4 red, 9 green
+Game 22: 11 blue, 2 red, 6 green; 16 blue, 5 red, 6 green; 12 red, 2 green, 10 blue; 14 blue, 2 green, 11 red
+Game 23: 3 red, 5 green; 10 blue, 1 green, 9 red; 2 red, 10 green, 9 blue; 9 blue, 7 green
+Game 24: 8 blue, 1 red; 3 red, 9 blue; 9 green, 2 red, 8 blue
+Game 25: 2 red, 1 green, 1 blue; 1 green, 12 blue, 2 red; 2 red, 1 blue; 2 blue; 1 green, 10 blue; 6 blue
+Game 26: 2 red; 4 green, 1 red, 7 blue; 11 blue, 2 red, 4 green; 1 red, 1 blue; 1 red, 5 green, 12 blue
+Game 27: 1 red, 7 green, 8 blue; 13 green, 12 blue, 1 red; 6 red, 1 green, 10 blue; 8 red, 2 blue, 2 green; 11 blue, 4 green, 4 red
+Game 28: 1 red, 8 blue, 3 green; 12 green, 4 blue; 1 red, 4 blue, 11 green; 7 blue, 10 green, 10 red; 11 blue, 7 red, 8 green; 10 red, 2 green, 2 blue
+Game 29: 4 green, 2 red; 1 blue, 11 red; 2 blue, 3 green, 1 red; 16 red; 3 green, 8 red, 1 blue; 2 blue, 7 green, 12 red
+Game 30: 1 blue, 3 green; 4 green, 2 blue; 3 red, 5 blue; 4 green, 1 red
+Game 31: 2 red, 2 blue, 3 green; 2 green, 3 blue, 8 red; 7 red, 16 blue, 2 green; 5 red, 20 blue, 2 green
+Game 32: 2 red, 1 green, 4 blue; 4 green, 4 red, 1 blue; 4 red, 4 blue; 1 blue, 4 red, 2 green; 4 blue, 3 green, 4 red
+Game 33: 11 green, 4 blue, 10 red; 2 green, 13 red, 7 blue; 13 red, 2 blue, 8 green; 15 red, 9 blue, 12 green; 14 red, 10 green, 2 blue; 13 red, 7 green
+Game 34: 11 red, 6 blue, 4 green; 16 red, 7 blue, 4 green; 6 red, 18 green, 6 blue; 3 blue, 16 red, 3 green; 2 red, 3 blue, 17 green; 3 green, 9 red, 6 blue
+Game 35: 6 green, 10 red, 12 blue; 4 red, 1 blue, 2 green; 3 green, 8 blue, 7 red; 6 red, 12 blue, 2 green
+Game 36: 4 green, 2 blue, 2 red; 3 green, 10 red, 1 blue; 1 blue, 3 green, 2 red; 2 green, 1 red; 1 blue, 5 red
+Game 37: 3 blue, 1 red, 2 green; 8 red, 4 green, 10 blue; 4 red, 4 green
+Game 38: 13 green, 3 red, 2 blue; 1 red, 13 green, 2 blue; 20 green, 3 red, 2 blue; 1 red, 2 blue, 12 green
+Game 39: 13 blue, 1 red, 8 green; 5 red, 3 green, 8 blue; 6 blue, 4 green; 18 blue, 7 green, 1 red; 4 green, 3 blue, 5 red; 6 blue, 4 red, 1 green
+Game 40: 2 red, 2 blue, 9 green; 1 blue, 2 red, 12 green; 16 green, 11 blue, 1 red; 1 green, 2 red; 3 blue, 2 red
+Game 41: 7 blue, 1 red; 4 blue, 1 red; 3 blue, 1 red, 2 green; 13 blue
+Game 42: 18 red, 1 green, 13 blue; 2 blue, 2 green, 7 red; 16 red, 12 blue; 1 green, 10 blue, 14 red
+Game 43: 15 red, 6 green, 2 blue; 3 blue, 9 red, 3 green; 13 red
+Game 44: 2 blue, 5 green, 3 red; 4 red, 4 blue, 19 green; 5 red, 3 blue, 9 green; 19 green, 6 red, 5 blue
+Game 45: 5 red, 4 green, 13 blue; 12 red, 10 blue; 3 green, 9 blue, 5 red; 10 blue, 18 red, 5 green; 16 red, 6 green, 17 blue
+Game 46: 3 green; 3 green, 2 blue; 4 blue, 2 red, 3 green; 5 blue, 3 green, 4 red; 1 green, 1 blue
+Game 47: 2 blue, 1 red, 10 green; 2 red; 6 red, 1 blue; 16 red, 2 blue, 8 green; 5 blue, 8 red, 7 green
+Game 48: 11 green, 4 red, 2 blue; 2 blue, 5 green, 8 red; 9 green, 6 red; 3 red, 3 green, 1 blue; 2 blue, 12 green, 17 red
+Game 49: 10 blue, 4 green, 1 red; 10 red, 10 blue; 12 blue, 7 red; 13 blue, 6 green
+Game 50: 1 red, 19 green, 7 blue; 4 red, 1 green, 5 blue; 16 green, 8 red, 8 blue
+Game 51: 12 green, 18 blue; 13 green, 14 blue, 4 red; 7 green, 4 red, 14 blue; 8 green, 2 blue, 3 red; 16 blue, 8 green
+Game 52: 9 blue, 9 green, 3 red; 8 blue, 1 green, 13 red; 2 red, 8 blue, 9 green; 13 red, 4 green; 6 green, 15 red; 11 blue, 11 red, 9 green
+Game 53: 2 red, 4 green, 3 blue; 5 blue, 16 green; 4 blue, 8 red, 12 green
+Game 54: 6 red, 16 green; 6 red, 15 green; 8 green, 8 red, 2 blue
+Game 55: 9 red, 2 green; 4 blue; 2 green, 2 red, 7 blue; 1 red, 16 blue, 1 green; 17 blue, 5 red
+Game 56: 14 green, 3 red, 9 blue; 14 blue, 15 green, 2 red; 8 red, 13 blue, 15 green; 15 blue, 2 red, 12 green; 3 red, 7 blue, 10 green; 10 blue, 13 green
+Game 57: 1 blue, 10 green, 2 red; 4 blue, 9 green, 11 red; 2 blue
+Game 58: 4 red, 2 blue, 5 green; 1 blue, 5 green, 4 red; 3 green, 4 red, 8 blue; 4 blue, 7 green; 5 green, 4 blue; 1 blue, 6 red
+Game 59: 5 blue, 4 red, 3 green; 8 blue, 12 green, 5 red; 5 red, 8 blue, 15 green
+Game 60: 6 red, 12 blue, 1 green; 10 blue, 20 green, 4 red; 6 blue, 1 green, 5 red; 9 red, 12 blue, 14 green; 15 green, 1 red, 14 blue; 10 green, 13 blue
+Game 61: 1 blue, 12 green, 3 red; 4 green, 1 red, 4 blue; 8 red, 4 green, 6 blue
+Game 62: 6 blue, 7 green, 3 red; 6 blue, 3 red, 3 green; 11 green, 6 red, 2 blue; 2 red, 6 blue, 3 green; 2 green, 3 blue, 3 red; 3 blue, 11 green, 11 red
+Game 63: 5 green, 6 blue, 4 red; 6 green, 12 blue; 3 green, 9 blue, 10 red; 1 blue, 4 red, 5 green
+Game 64: 10 green, 14 red; 1 blue, 9 red; 3 green, 10 blue, 14 red; 5 green, 3 blue, 12 red; 5 blue, 12 red, 13 green
+Game 65: 1 red, 5 green, 10 blue; 14 red, 5 green, 10 blue; 10 blue, 10 red
+Game 66: 9 green, 8 blue, 1 red; 8 red, 14 blue; 8 red, 7 blue, 2 green; 4 blue, 3 green, 5 red; 2 red, 8 green, 8 blue
+Game 67: 4 red, 3 green, 3 blue; 4 green, 1 blue, 4 red; 1 blue, 3 red; 10 blue; 16 blue, 6 red, 4 green
+Game 68: 6 blue, 6 green, 9 red; 4 blue, 9 red, 3 green; 3 blue, 8 red
+Game 69: 4 green, 12 red, 3 blue; 2 red, 3 blue; 2 blue, 4 red, 2 green; 1 blue, 3 red
+Game 70: 4 red, 3 green, 15 blue; 1 green, 4 red; 1 red, 1 green, 5 blue
+Game 71: 4 blue, 2 red, 10 green; 7 red, 6 blue, 11 green; 4 blue, 7 red, 8 green
+Game 72: 9 red, 9 blue, 1 green; 4 red, 6 green, 5 blue; 3 green, 7 red, 2 blue
+Game 73: 3 green, 9 red; 4 green, 15 red; 12 red, 2 blue; 14 red, 3 green
+Game 74: 2 red, 6 blue, 1 green; 3 red, 6 blue; 1 green, 12 blue, 14 red
+Game 75: 3 green, 18 red; 1 green, 7 red, 1 blue; 2 red, 2 green, 3 blue; 11 red; 2 red, 3 green, 2 blue
+Game 76: 6 green, 2 red, 5 blue; 13 green, 5 blue; 5 blue, 1 red, 1 green
+Game 77: 4 blue, 6 green, 3 red; 15 red, 1 green; 4 green, 11 red, 13 blue; 8 blue, 6 green, 9 red; 3 blue, 1 green, 11 red; 3 green, 3 red
+Game 78: 11 green, 1 blue, 2 red; 7 red, 16 blue, 11 green; 9 blue, 10 red, 6 green; 1 green, 8 blue, 10 red; 8 blue, 6 red, 1 green
+Game 79: 2 blue, 5 green, 4 red; 1 blue, 1 red, 1 green; 1 blue, 5 red, 10 green; 6 red, 3 green, 3 blue; 8 red, 9 green, 6 blue; 7 blue, 6 green, 13 red
+Game 80: 10 green, 7 blue, 5 red; 5 red, 1 green, 6 blue; 8 blue, 2 red, 8 green
+Game 81: 3 green, 10 red; 6 blue, 8 green, 14 red; 4 green, 4 blue, 13 red; 5 blue, 11 green, 6 red; 16 red, 8 green, 5 blue; 6 green, 18 red, 6 blue
+Game 82: 13 red, 1 green, 7 blue; 8 green, 4 blue, 12 red; 18 red, 5 green, 3 blue; 13 red, 4 green, 9 blue
+Game 83: 1 red, 3 green, 4 blue; 5 blue, 4 green, 1 red; 3 green, 1 red, 12 blue; 4 green, 11 blue
+Game 84: 3 blue, 10 green, 2 red; 3 red, 8 blue; 11 blue, 12 red, 14 green; 2 red, 11 green, 2 blue
+Game 85: 8 blue, 2 green, 1 red; 13 blue, 6 red; 3 blue, 5 green
+Game 86: 16 red, 8 blue; 7 blue; 16 red, 16 blue, 1 green; 15 blue, 11 red; 2 green, 7 red, 5 blue
+Game 87: 6 green, 9 blue, 4 red; 1 red, 1 green, 4 blue; 5 blue, 13 green, 3 red; 2 green, 4 red; 16 blue, 10 green, 3 red
+Game 88: 1 blue, 14 red; 14 red, 3 blue, 8 green; 1 blue, 5 green
+Game 89: 12 green, 14 blue, 3 red; 2 red, 3 blue, 3 green; 2 blue, 8 green; 1 red, 3 green, 15 blue; 3 red, 5 blue
+Game 90: 3 blue, 17 red, 11 green; 2 red, 2 blue, 7 green; 7 blue; 8 blue, 4 green, 10 red; 1 blue, 4 red
+Game 91: 10 red, 9 blue, 8 green; 5 blue, 10 red, 2 green; 11 red, 17 green, 7 blue; 12 blue, 16 red, 18 green; 20 green, 5 blue, 15 red
+Game 92: 1 green, 14 red, 1 blue; 2 blue, 6 green; 9 red, 6 green; 5 blue, 5 red, 2 green; 3 blue, 3 green, 10 red; 5 blue, 1 red
+Game 93: 10 green, 1 red, 6 blue; 16 red, 5 blue, 2 green; 3 red, 7 green, 11 blue; 12 green, 5 blue, 4 red; 8 green, 7 blue, 10 red; 1 red, 5 blue
+Game 94: 3 blue, 1 red, 3 green; 1 blue, 4 green, 4 red; 9 green
+Game 95: 3 green, 5 blue, 9 red; 2 green, 9 red, 2 blue; 12 red, 9 green; 11 green, 9 red, 9 blue; 9 blue, 6 green, 10 red; 13 red, 2 blue, 5 green
+Game 96: 2 red, 19 blue, 2 green; 10 blue, 1 red, 2 green; 9 blue, 1 red; 2 green, 3 blue; 1 green, 1 red, 11 blue
+Game 97: 6 green, 7 blue, 5 red; 7 green, 1 red, 11 blue; 6 green, 6 red, 5 blue; 2 red, 9 blue, 1 green
+Game 98: 5 green, 8 red, 15 blue; 16 green, 9 blue, 8 red; 5 blue, 3 red, 2 green; 13 blue, 12 green, 4 red; 2 red, 15 green, 3 blue; 1 green, 11 blue, 2 red
+Game 99: 1 green, 7 blue, 6 red; 16 blue, 9 red; 1 green, 17 red, 12 blue; 15 red, 7 blue; 8 blue, 14 red
+Game 100: 5 blue, 11 red, 6 green; 11 red, 2 blue, 5 green; 6 blue, 6 green; 2 blue, 6 red, 15 green; 7 red, 4 blue, 7 green
diff --git a/2023/src/day2.rs b/2023/src/day2.rs
new file mode 100644
index 0000000..05fe70f
--- /dev/null
+++ b/2023/src/day2.rs
@@ -0,0 +1,357 @@
+const INPUT: &str = include_str!("../data/day2.txt");
+
+const MAX_RED: usize = 12;
+const MAX_GREEN: usize = 13;
+const MAX_BLUE: usize = 14;
+
+pub fn day2a() -> String {
+    let games = INPUT.lines().map(parse_game);
+
+    format!(
+        "{}",
+        possible_games(games).fold(0, |acc, game| acc + game.0)
+    )
+}
+
+pub fn day2b() -> String {
+    let games = INPUT.lines().map(parse_game);
+
+    let power = games
+        .into_iter()
+        .map(|game| fewest_cubes(&game).power())
+        .fold(0, |acc, power| acc + power);
+
+    format!("{}", power)
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Game(usize, Vec<Info>);
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Info {
+    red: usize,
+    green: usize,
+    blue: usize,
+}
+
+impl Info {
+    fn power(&self) -> usize {
+        self.red * self.green * self.blue
+    }
+}
+
+pub(crate) fn possible_games(games: impl Iterator<Item = Game>) -> impl Iterator<Item = Game> {
+    games.filter(|game| {
+        game.1
+            .iter()
+            .all(|info| info.red <= MAX_RED && info.green <= MAX_GREEN && info.blue <= MAX_BLUE)
+    })
+}
+
+pub(crate) fn fewest_cubes(game: &Game) -> Info {
+    let mut min_red = 0;
+    let mut min_green = 0;
+    let mut min_blue = 0;
+
+    for info in game.1.iter() {
+        if info.red > min_red {
+            min_red = info.red;
+        }
+        if info.green > min_green {
+            min_green = info.green;
+        }
+        if info.blue > min_blue {
+            min_blue = info.blue;
+        }
+    }
+
+    Info {
+        red: min_red,
+        green: min_green,
+        blue: min_blue,
+    }
+}
+
+pub(crate) fn parse_game(input: &str) -> Game {
+    let mut parts = input.split(':');
+    let number = parse_game_number(parts.next().unwrap());
+    let info_line = parts.next().unwrap().split(';');
+    let info = info_line
+        .map(|block| parse_info(block))
+        .collect::<Vec<Info>>();
+    Game(number, info)
+}
+
+pub(crate) fn parse_game_number(input: &str) -> usize {
+    let mut parts = input.split(' ');
+    assert_eq!(parts.next(), Some("Game"));
+    parts.next().unwrap().parse::<usize>().unwrap()
+}
+
+pub(crate) fn parse_info(input: &str) -> Info {
+    let mut info = Info {
+        red: 0,
+        green: 0,
+        blue: 0,
+    };
+    for part in input.trim().split(',') {
+        let mut sep = part.trim().split(' ');
+        let count = sep.next().unwrap().trim();
+        let color = sep.next().unwrap().trim();
+        match color {
+            "red" => info.red = count.parse::<usize>().unwrap(),
+            "green" => info.green = count.parse::<usize>().unwrap(),
+            "blue" => info.blue = count.parse::<usize>().unwrap(),
+            _ => unreachable!(),
+        }
+    }
+
+    info
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const INPUT: &str = "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";
+
+    #[test]
+    fn parses_a_game() {
+        let test_cases = [
+            (
+                "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+                Game(
+                    1,
+                    vec![
+                        Info {
+                            red: 4,
+                            green: 0,
+                            blue: 3,
+                        },
+                        Info {
+                            red: 1,
+                            green: 2,
+                            blue: 6,
+                        },
+                        Info {
+                            red: 0,
+                            green: 2,
+                            blue: 0,
+                        },
+                    ],
+                ),
+                "Game 1",
+            ),
+            (
+                "Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue",
+                Game(
+                    2,
+                    vec![
+                        Info {
+                            red: 0,
+                            green: 2,
+                            blue: 1,
+                        },
+                        Info {
+                            red: 1,
+                            green: 3,
+                            blue: 4,
+                        },
+                        Info {
+                            red: 0,
+                            green: 1,
+                            blue: 1,
+                        },
+                    ],
+                ),
+                "Game 2",
+            ),
+            (
+                "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red",
+                Game(
+                    3,
+                    vec![
+                        Info {
+                            red: 20,
+                            green: 8,
+                            blue: 6,
+                        },
+                        Info {
+                            red: 4,
+                            green: 13,
+                            blue: 5,
+                        },
+                        Info {
+                            red: 1,
+                            green: 5,
+                            blue: 0,
+                        },
+                    ],
+                ),
+                "Game 3",
+            ),
+            (
+                "Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red",
+                Game(
+                    4,
+                    vec![
+                        Info {
+                            red: 3,
+                            green: 1,
+                            blue: 6,
+                        },
+                        Info {
+                            red: 6,
+                            green: 3,
+                            blue: 0,
+                        },
+                        Info {
+                            red: 14,
+                            green: 3,
+                            blue: 15,
+                        },
+                    ],
+                ),
+                "Game 4",
+            ),
+            (
+                "Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green",
+                Game(
+                    5,
+                    vec![
+                        Info {
+                            red: 6,
+                            green: 3,
+                            blue: 1,
+                        },
+                        Info {
+                            red: 1,
+                            green: 2,
+                            blue: 2,
+                        },
+                    ],
+                ),
+                "Game 5",
+            ),
+        ];
+
+        for (input, expected, message) in test_cases {
+            assert_eq!(parse_game(input), expected, "{}", message);
+        }
+    }
+
+    #[test]
+    fn possible_games() {
+        let games = INPUT.lines().map(parse_game);
+        let games = super::possible_games(games).collect::<Vec<Game>>();
+        assert_eq!(games.len(), 3);
+        assert_eq!(
+            games.into_iter().map(|g| g.0).collect::<Vec<usize>>(),
+            vec![1, 2, 5]
+        );
+    }
+
+    #[test]
+    fn fewest_cubes() {
+        let test_cases = [
+            (
+                "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+                Info {
+                    red: 4,
+                    green: 2,
+                    blue: 6,
+                },
+                "Game 1",
+            ),
+            (
+                "Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue",
+                Info {
+                    red: 1,
+                    green: 3,
+                    blue: 4,
+                },
+                "Game 2",
+            ),
+            (
+                "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red",
+                Info {
+                    red: 20,
+                    green: 13,
+                    blue: 6,
+                },
+                "Game 3",
+            ),
+            (
+                "Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red",
+                Info {
+                    red: 14,
+                    green: 3,
+                    blue: 15,
+                },
+                "Game 4",
+            ),
+            (
+                "Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green",
+                Info {
+                    red: 6,
+                    green: 3,
+                    blue: 2,
+                },
+                "Game 5",
+            ),
+        ];
+
+        for (input, expected, message) in test_cases {
+            assert_eq!(
+                super::fewest_cubes(&super::parse_game(input)),
+                expected,
+                "{}",
+                message
+            );
+        }
+    }
+
+    #[test]
+    fn game_power() {
+        let test_cases = [
+            (
+                "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+                48,
+                "Game 1",
+            ),
+            (
+                "Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue",
+                12,
+                "Game 2",
+            ),
+            (
+                "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red",
+                1560,
+                "Game 3",
+            ),
+            (
+                "Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red",
+                630,
+                "Game 4",
+            ),
+            (
+                "Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green",
+                36,
+                "Game 5",
+            ),
+        ];
+
+        for (input, expected, message) in test_cases {
+            assert_eq!(
+                super::fewest_cubes(&super::parse_game(input)).power(),
+                expected,
+                "{}",
+                message
+            );
+        }
+    }
+}
diff --git a/2023/src/main.rs b/2023/src/main.rs
index 4f33f0b..0dd1945 100644
--- a/2023/src/main.rs
+++ b/2023/src/main.rs
@@ -1,4 +1,5 @@
 mod day1;
+mod day2;
 
 fn main() {
     let day = std::env::args().skip(1).next();
@@ -6,6 +7,8 @@ fn main() {
     let result = match day.as_ref().map(|v| v.as_ref()) {
         Some("1a") => day1::day1a(),
         Some("1b") => day1::day1b(),
+        Some("2a") => day2::day2a(),
+        Some("2b") => day2::day2b(),
         _ => panic!("unrecognized day"),
     };