diff --git a/Cargo.lock b/Cargo.lock
index 5a4b742..1c2f74e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -22,6 +22,9 @@ dependencies = [
 [[package]]
 name = "day2"
 version = "0.1.0"
+dependencies = [
+ "regex",
+]
 
 [[package]]
 name = "day3"
diff --git a/day2/Cargo.toml b/day2/Cargo.toml
index 8aa34bb..59b0ab3 100644
--- a/day2/Cargo.toml
+++ b/day2/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+regex = "1.10.2"
diff --git a/day2/src/input.txt b/day2/src/input.txt
new file mode 100644
index 0000000..72084d0
--- /dev/null
+++ b/day2/src/input.txt
@@ -0,0 +1,100 @@
+Game 1: 7 blue, 4 red, 11 green; 2 red, 2 blue, 7 green; 2 red, 13 blue, 8 green; 18 blue, 7 green, 5 red
+Game 2: 3 green, 4 red, 4 blue; 6 red, 4 green, 4 blue; 2 blue, 4 green, 3 red
+Game 3: 1 red, 2 green, 3 blue; 1 red, 2 green; 2 green, 3 red; 1 blue, 2 red
+Game 4: 1 red, 15 green; 1 green, 2 blue; 12 green, 1 red, 2 blue; 14 green; 2 green, 1 blue, 2 red
+Game 5: 8 red; 7 red; 11 red, 4 green; 1 blue, 8 red; 6 red, 2 green, 1 blue; 8 green, 13 red, 1 blue
+Game 6: 3 blue, 2 red, 6 green; 2 red, 8 green, 1 blue; 1 red, 3 blue
+Game 7: 5 green, 1 red, 1 blue; 6 blue, 12 red; 6 red, 7 green; 3 green, 1 blue
+Game 8: 10 red, 6 green; 4 blue, 6 green, 5 red; 8 green, 5 red, 5 blue; 2 red, 4 blue
+Game 9: 11 blue, 13 red, 3 green; 13 red, 1 green, 6 blue; 8 blue, 4 green, 5 red; 16 red, 7 green, 10 blue; 16 red, 5 green, 6 blue; 17 red, 6 blue
+Game 10: 16 blue, 8 green; 2 red, 4 green, 1 blue; 15 blue; 4 red, 5 green, 4 blue
+Game 11: 3 blue, 8 red, 10 green; 10 red, 6 green; 1 red, 1 green; 13 red, 1 green, 1 blue; 3 green, 7 red; 2 blue, 6 green, 2 red
+Game 12: 1 red, 10 green; 4 red, 6 green, 1 blue; 9 green, 1 blue, 7 red; 1 blue, 13 green, 2 red; 2 blue, 5 red, 11 green
+Game 13: 1 red, 5 blue; 1 red, 6 green; 2 blue, 1 red; 2 blue, 1 red, 2 green; 5 green, 2 blue
+Game 14: 4 green; 8 blue, 1 red, 2 green; 7 red, 2 green, 4 blue; 4 blue, 7 green; 7 blue, 2 green, 1 red; 7 blue, 5 red
+Game 15: 10 green, 3 red; 8 blue, 14 green, 3 red; 4 red, 1 green, 12 blue
+Game 16: 8 red, 4 blue, 6 green; 14 blue, 9 red, 10 green; 1 red, 5 blue, 8 green; 14 blue, 11 green, 3 red
+Game 17: 20 blue, 5 red, 4 green; 3 red, 14 blue; 4 red, 4 blue, 4 green; 12 blue, 5 red, 3 green
+Game 18: 7 blue, 8 red; 1 blue, 2 red; 1 green, 2 blue
+Game 19: 14 green, 4 blue; 6 green; 12 green, 5 blue; 12 green, 1 red, 1 blue; 4 blue, 10 green
+Game 20: 3 green, 4 blue, 4 red; 13 blue, 1 red, 2 green; 13 blue, 9 green, 9 red
+Game 21: 4 green, 2 blue, 2 red; 3 green, 2 blue; 1 blue, 5 green; 1 blue, 2 red, 3 green; 1 green, 1 blue, 2 red; 6 blue, 1 green
+Game 22: 4 red, 17 green; 15 green, 3 blue, 2 red; 4 blue, 7 red, 11 green; 16 green, 4 red; 3 blue, 2 red
+Game 23: 19 green, 2 blue, 3 red; 1 red, 2 blue, 2 green; 2 blue, 10 green, 11 red
+Game 24: 1 red, 3 blue; 2 blue; 1 green, 1 red, 3 blue; 1 red, 1 green
+Game 25: 12 green, 2 red, 10 blue; 6 green, 3 red; 3 green, 18 blue, 3 red; 17 green, 3 red, 18 blue
+Game 26: 4 red, 12 blue, 5 green; 3 green, 5 red, 1 blue; 6 blue, 4 green, 1 red; 6 blue, 7 green; 3 green, 5 red, 2 blue; 1 green, 2 blue, 9 red
+Game 27: 1 red, 9 green; 3 green; 9 green, 2 blue, 1 red; 10 green, 1 blue; 1 red, 5 green, 3 blue
+Game 28: 10 red, 8 green; 2 blue, 4 green, 7 red; 2 green, 9 red, 1 blue
+Game 29: 5 blue, 5 green, 3 red; 1 green, 2 blue, 3 red; 2 green, 3 blue, 5 red; 3 red, 11 blue
+Game 30: 11 red, 5 green; 4 blue, 3 green, 5 red; 6 blue, 3 green, 5 red
+Game 31: 2 blue, 8 green, 14 red; 9 green; 1 red, 1 blue, 4 green; 2 green, 10 red; 1 red, 10 green, 2 blue; 8 green, 14 red
+Game 32: 14 green, 6 red, 6 blue; 1 red, 2 blue, 15 green; 2 red, 18 green, 1 blue
+Game 33: 16 green, 4 red; 18 green, 3 red; 5 red, 10 green; 5 red, 19 green; 11 green, 4 red; 11 red, 1 blue, 2 green
+Game 34: 1 blue, 11 red; 5 red, 4 green; 4 green, 1 blue, 12 red; 2 blue, 1 green, 7 red; 3 green, 1 blue, 12 red
+Game 35: 5 red, 1 blue; 1 blue, 1 red; 2 blue, 2 green, 15 red; 7 red, 2 green; 3 blue, 1 green, 1 red; 16 red, 3 blue, 1 green
+Game 36: 10 green, 16 red; 2 blue, 14 green, 6 red; 1 blue, 8 green, 12 red
+Game 37: 17 green, 14 blue; 10 green, 12 blue; 10 blue, 1 red, 8 green
+Game 38: 9 blue, 2 green; 5 blue, 1 green, 5 red; 6 blue, 2 green, 7 red; 17 red, 1 green, 7 blue; 1 green, 9 blue, 16 red
+Game 39: 2 red, 13 blue, 10 green; 5 blue, 15 green, 1 red; 13 blue, 5 green; 3 red, 6 blue, 2 green; 17 green, 1 blue, 4 red; 4 red, 1 blue, 11 green
+Game 40: 4 green, 12 blue; 5 red, 13 blue, 1 green; 4 green, 7 red; 7 blue, 2 green
+Game 41: 3 red, 1 green; 10 green, 4 blue, 5 red; 8 blue, 5 red
+Game 42: 8 blue, 12 red, 5 green; 8 red, 5 green, 4 blue; 3 green, 13 red; 8 blue, 16 red; 12 red, 3 green, 1 blue; 2 blue, 2 green, 6 red
+Game 43: 5 blue, 4 red; 10 red, 6 blue; 12 red, 2 blue, 1 green; 7 blue, 12 red, 1 green
+Game 44: 11 blue, 5 red; 2 red, 13 green, 5 blue; 7 red, 7 blue, 11 green
+Game 45: 7 red, 6 blue; 5 blue, 6 green; 5 green, 5 blue, 7 red; 4 red, 9 green, 12 blue; 9 blue, 12 green, 1 red
+Game 46: 2 green, 7 blue, 20 red; 18 green, 2 blue; 8 blue, 1 red, 3 green; 6 green, 1 blue; 2 red, 6 blue, 4 green
+Game 47: 6 red, 6 blue; 14 blue, 7 green, 2 red; 8 blue, 3 red
+Game 48: 1 red, 5 blue; 3 blue, 15 green, 2 red; 6 blue, 1 red, 13 green; 6 green, 4 blue, 3 red; 11 green, 3 blue
+Game 49: 1 green, 15 blue, 3 red; 15 green, 6 blue; 12 green, 2 red, 8 blue; 3 green, 16 blue
+Game 50: 8 blue, 7 red, 1 green; 6 blue, 1 green, 2 red; 3 red, 7 blue; 4 blue, 6 red, 1 green
+Game 51: 2 red, 5 blue; 2 red, 10 green; 11 green, 1 blue; 9 green, 1 blue, 2 red; 5 blue, 11 green; 1 red, 8 green, 1 blue
+Game 52: 1 green, 1 red, 15 blue; 17 blue, 1 red; 5 red, 1 green; 19 blue, 6 red, 3 green; 5 blue, 1 green
+Game 53: 1 blue, 12 red, 6 green; 3 red, 7 green, 3 blue; 2 blue, 7 red, 5 green; 4 red, 3 blue, 19 green; 10 red, 12 green, 2 blue; 5 blue, 7 red, 14 green
+Game 54: 12 green, 1 red, 4 blue; 3 blue, 5 red, 8 green; 9 green, 6 blue; 3 green, 2 red, 11 blue; 3 green, 10 blue, 7 red; 2 red, 3 green, 4 blue
+Game 55: 5 red, 3 blue; 4 blue, 6 green; 10 blue, 1 green; 7 green, 4 red, 14 blue; 2 red, 9 blue, 10 green; 5 red, 10 blue, 10 green
+Game 56: 3 green, 11 blue; 4 blue, 10 green, 8 red; 2 blue, 5 green, 2 red; 1 blue, 1 green, 8 red; 5 green, 7 red, 3 blue
+Game 57: 2 green, 2 blue, 3 red; 8 red, 5 green, 2 blue; 16 red, 12 blue, 7 green; 13 blue, 6 red, 2 green; 12 red, 1 green
+Game 58: 2 green, 3 blue, 8 red; 3 green, 4 blue, 7 red; 2 blue, 11 red, 4 green; 4 green, 1 blue, 2 red; 3 green, 3 red, 2 blue
+Game 59: 10 red, 6 blue, 2 green; 2 green, 6 blue, 14 red; 3 green, 11 red, 7 blue; 1 blue, 1 green
+Game 60: 5 blue, 10 red; 4 blue, 12 red; 2 green, 3 red, 4 blue
+Game 61: 4 blue, 1 green; 10 blue, 2 red; 6 blue, 1 red; 1 green, 7 red; 5 blue, 5 red
+Game 62: 6 blue, 7 red, 1 green; 7 blue, 7 green, 15 red; 14 green, 16 red, 2 blue; 2 blue, 17 red; 4 red, 11 green, 6 blue; 13 green, 16 red, 5 blue
+Game 63: 4 red, 13 green, 1 blue; 2 green, 5 blue, 10 red; 3 green, 8 red; 1 blue, 3 red, 11 green; 1 red, 7 blue
+Game 64: 12 green, 1 blue; 8 red, 1 blue, 10 green; 11 green, 1 blue, 3 red; 10 green, 2 red, 1 blue; 1 blue, 9 green, 8 red
+Game 65: 5 green, 2 red; 7 blue, 5 red, 10 green; 9 green, 8 blue; 3 blue, 4 red, 8 green; 11 green, 6 red, 16 blue
+Game 66: 8 green, 1 red, 4 blue; 10 green, 5 blue, 7 red; 5 blue, 3 red, 6 green; 4 blue, 12 green, 6 red; 16 green, 3 red; 16 green, 7 red, 4 blue
+Game 67: 6 green; 7 red, 1 green, 5 blue; 10 red, 13 green, 3 blue; 8 green, 11 red, 6 blue; 14 red, 5 green, 7 blue
+Game 68: 1 red, 8 green, 3 blue; 1 green, 1 red, 1 blue; 1 green, 11 blue, 1 red
+Game 69: 2 red, 4 green, 1 blue; 4 blue, 10 green; 4 green, 1 blue, 2 red; 12 green, 5 blue; 6 blue, 3 green
+Game 70: 1 blue, 3 green, 2 red; 1 green, 2 blue; 5 green, 1 red; 2 blue, 4 green; 1 red, 5 green
+Game 71: 6 blue, 3 red, 12 green; 2 red, 8 green, 3 blue; 8 green, 8 blue; 7 blue, 1 red, 9 green; 2 green, 4 blue, 1 red; 3 red, 7 blue, 8 green
+Game 72: 8 red, 7 blue, 6 green; 2 red, 8 blue, 7 green; 2 red, 5 blue, 1 green; 4 green, 6 blue, 1 red; 11 green, 13 red, 3 blue; 8 green, 11 red, 2 blue
+Game 73: 7 blue, 17 red, 4 green; 1 red, 4 green, 2 blue; 3 red, 4 blue, 4 green; 5 blue, 5 red; 6 red, 2 blue; 11 red, 1 green, 4 blue
+Game 74: 3 red, 2 green; 4 red, 12 blue, 4 green; 7 red, 6 blue, 10 green
+Game 75: 6 blue, 7 green; 8 green, 9 blue, 1 red; 6 red, 4 blue, 9 green; 10 red, 9 blue, 4 green; 6 red, 2 blue, 1 green; 7 green
+Game 76: 10 red, 8 green; 2 red, 2 blue, 5 green; 1 red, 1 blue, 1 green; 9 red, 11 green, 2 blue; 2 blue, 9 green, 3 red; 6 green, 14 red
+Game 77: 9 blue, 1 red, 3 green; 8 blue, 17 green, 4 red; 5 green, 1 blue, 2 red; 6 green, 1 red, 9 blue; 4 green, 10 red; 9 red, 3 blue
+Game 78: 5 green, 10 blue; 2 green, 5 blue, 11 red; 1 red, 1 green, 6 blue; 1 red, 8 blue, 4 green
+Game 79: 3 green, 1 blue, 2 red; 8 green, 1 blue, 2 red; 2 blue, 1 red, 11 green
+Game 80: 12 blue, 3 green; 6 red, 4 green, 13 blue; 4 blue, 8 red; 3 green, 4 blue
+Game 81: 1 green, 5 blue; 1 green, 3 blue, 1 red; 1 blue, 1 red, 3 green; 6 blue, 5 green
+Game 82: 2 green, 1 blue; 10 blue, 1 red, 6 green; 4 green, 20 blue, 1 red; 20 blue, 2 green, 1 red
+Game 83: 2 green, 9 blue, 10 red; 12 red, 11 blue, 4 green; 11 blue, 8 red, 3 green; 17 green, 4 blue; 12 green, 4 red, 6 blue; 1 red, 11 green, 8 blue
+Game 84: 7 green, 15 red, 15 blue; 4 blue, 3 green, 18 red; 2 blue, 1 red, 2 green; 8 blue, 19 red, 5 green; 11 blue, 3 red; 9 red, 2 blue
+Game 85: 14 green, 3 red, 16 blue; 3 blue, 6 green; 12 green, 6 blue, 2 red
+Game 86: 5 red, 6 green; 9 red, 4 green; 7 green, 1 blue, 2 red
+Game 87: 10 blue, 7 red, 1 green; 12 blue, 14 red; 7 blue, 7 red
+Game 88: 5 red, 10 green, 5 blue; 10 green, 2 red, 8 blue; 2 red, 14 green, 4 blue
+Game 89: 1 blue, 6 red, 12 green; 9 red, 13 green, 3 blue; 11 green, 6 red, 3 blue
+Game 90: 1 green, 8 blue, 10 red; 10 blue, 7 green; 6 blue, 15 red, 1 green; 1 blue, 16 red, 4 green
+Game 91: 8 red, 9 green, 2 blue; 2 red, 15 blue, 2 green; 15 blue, 1 red, 5 green; 1 green, 6 red, 10 blue
+Game 92: 10 blue, 4 red; 9 blue, 3 red, 7 green; 8 blue, 16 green, 3 red; 16 green, 16 blue
+Game 93: 1 blue, 2 green, 1 red; 4 red, 7 green, 12 blue; 6 green, 3 blue, 4 red; 8 blue, 4 red, 12 green; 5 red, 8 green; 1 red, 18 blue, 10 green
+Game 94: 1 blue, 5 red, 6 green; 7 red, 6 green, 1 blue; 8 red, 11 green; 12 green, 7 red, 1 blue; 7 red, 8 green
+Game 95: 10 red, 7 green; 2 green, 1 blue, 10 red; 6 green, 5 red, 1 blue
+Game 96: 3 blue, 12 red, 3 green; 13 red, 9 blue; 2 green, 5 red, 13 blue; 2 red, 18 blue, 4 green; 6 red, 6 blue, 7 green; 3 green, 15 red, 18 blue
+Game 97: 4 red, 3 green; 2 blue, 4 red, 5 green; 3 red, 3 green
+Game 98: 2 red, 19 blue; 2 blue; 11 blue, 2 red; 3 green, 5 blue, 1 red; 2 red, 1 blue; 17 blue
+Game 99: 2 red, 16 blue, 1 green; 2 green, 12 blue, 6 red; 1 red, 3 green, 3 blue; 8 red, 1 green; 2 red, 9 blue; 1 green, 7 red, 9 blue
+Game 100: 8 green, 3 red; 7 green, 4 red; 1 red, 7 green, 2 blue; 1 green, 2 red
diff --git a/day2/src/main.rs b/day2/src/main.rs
index e7a11a9..bdd2413 100644
--- a/day2/src/main.rs
+++ b/day2/src/main.rs
@@ -1,3 +1,6 @@
+mod part1;
+
 fn main() {
-    println!("Hello, world!");
+    println!("Part1: {}", part1::main(include_str!("input.txt")));
+    println!("Part2: TODO");
 }
diff --git a/day2/src/part1.rs b/day2/src/part1.rs
index bbbf130..e3427c6 100644
--- a/day2/src/part1.rs
+++ b/day2/src/part1.rs
@@ -1,16 +1,23 @@
-use rayon::prelude::*;
 use regex::{Match, Regex};
-use std::fs;
+
+pub fn main(input: &str) -> i32 {
+    let bag = Contents {
+        red: 12,
+        green: 13,
+        blue: 14,
+    };
+    let games = Games::new(input, bag);
+    games.valid_sum()
+}
 
 struct Games {
     games: Vec<Game>,
 }
 
 impl Games {
-    fn new(file: &str, bag: Contents) -> Self {
+    fn new(input: &str, bag: Contents) -> Self {
         Self {
-            games: fs::read_to_string(file)
-                .unwrap()
+            games: input
                 .lines()
                 .map(|m| Game::new(m.to_owned(), bag.clone()))
                 .collect(),
@@ -18,13 +25,13 @@ impl Games {
     }
     fn valid_games(self) -> Vec<i32> {
         self.games
-            .par_iter()
+            .iter()
             .filter(|m| m.valid())
             .map(|m| m.id)
             .collect()
     }
     fn valid_sum(self) -> i32 {
-        self.valid_games().par_iter().sum()
+        self.valid_games().iter().sum()
     }
 }
 
@@ -61,7 +68,7 @@ impl Game {
             .collect()
     }
     fn valid(&self) -> bool {
-        self.draws.par_iter().all(|m| self.bag.valid(m))
+        self.draws.iter().all(|m| self.bag.valid(m))
     }
 }
 
@@ -118,12 +125,17 @@ impl Contents {
     }
 }
 
-pub(crate) fn main() {
-    let bag = Contents {
-        red: 12,
-        green: 13,
-        blue: 14,
-    };
-    let games = Games::new("inputs/2023/day2_1.txt", bag);
-    println!("{}", games.valid_sum());
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn example() {
+        let input = "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";
+        assert_eq!(main(input), 8);
+    }
 }