diff --git a/day3/Cargo.toml b/day3/Cargo.toml
index 8aa34bb..898e70d 100644
--- a/day3/Cargo.toml
+++ b/day3/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "day2"
+name = "day3"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/day4/Cargo.toml b/day4/Cargo.toml
new file mode 100644
index 0000000..8842130
--- /dev/null
+++ b/day4/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day4/input b/day4/input
new file mode 100644
index 0000000..2b59c41
--- /dev/null
+++ b/day4/input
@@ -0,0 +1,601 @@
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diff --git a/day4/src/main.rs b/day4/src/main.rs
new file mode 100644
index 0000000..b58d9d5
--- /dev/null
+++ b/day4/src/main.rs
@@ -0,0 +1,112 @@
+use std::{fs, env};
+
+
+fn read_input(path: &str) -> String {
+    return fs::read_to_string(path).expect("Cannot read file.");
+}
+
+fn get_drawn_numbers(s: &str) -> (Vec<u32>, String) {
+    let v = s.split_once("\n").unwrap();
+    return (v.0.split(",").filter_map(|e| e.parse::<u32>().ok()).collect(), v.1.to_owned());
+}
+
+fn get_bingo_boards(s: &str) -> Vec<Vec<Vec<(u32, bool)>>> {
+    let i:Vec<Vec<&str>> = s.split("\n\n").map(|e| e.split("\n").collect()).collect();
+    let v:Vec<Vec<Vec<(u32, bool)>>> = i.iter()
+        .map(|e| e.iter()
+             .filter(|f| !f.is_empty())
+             .map(|f| f.split_whitespace()
+                  .filter_map(|g| g.parse::<u32>().ok())
+                  .map(|g| (g, false))
+                  .collect())
+             .collect())
+        .collect();
+    return v;
+}
+
+fn is_winning_bingo_board(b: &Vec<Vec<(u32, bool)>>) -> bool {
+    for r in 0..b.len() {
+        let mut is_win = true;
+        for c in 0..b[r].len() {
+            if !b[r][c].1 && is_win {
+                is_win = false;
+            }
+        }
+        if is_win { return true;}
+    }
+
+    for c in 0..b[0].len() {
+        let mut is_win = true;
+        for r in 0..b.len() {
+            if !b[r][c].1 && is_win {
+                is_win = false;
+            }
+        }
+        if is_win {return true;}
+    }
+    return false;
+}
+
+fn mark_numbers_bingo_board(n: u32, b: &mut Vec<Vec<(u32, bool)>>) {
+    for r in 0..b.len() {
+        for c in 0..b[r].len() {
+            if b[r][c].0 == n {
+                b[r][c].1 = true;
+            }
+        }
+    }
+}
+
+fn get_sum_unmarked_numbers(b: &Vec<Vec<(u32, bool)>>) -> u32 {
+    let mut a = 0;
+    for r in 0..b.len() {
+        for c in 0..b[r].len() {
+            if !b[r][c].1 { a += b[r][c].0; }
+        }
+    }
+
+    return a;
+}
+
+fn win_bingo(d: Vec<u32>, b: &mut Vec<Vec<Vec<(u32, bool)>>>) -> (u32, u32) {
+    for i in d {
+        for e in 0..b.len() {
+            mark_numbers_bingo_board(i, &mut b[e]);
+            if is_winning_bingo_board(&b[e]) {
+                return (i, get_sum_unmarked_numbers(&b[e]));
+            }
+        }
+    }
+    return (0, 0);
+}
+
+fn lose_bingo(d: Vec<u32>, b: &mut Vec<Vec<Vec<(u32, bool)>>>) -> (u32, u32) {
+    let mut winning_boards = vec![false; b.len()];
+    for i in d {
+        for e in 0..b.len() {
+            mark_numbers_bingo_board(i, &mut b[e]);
+            if !winning_boards[e] && is_winning_bingo_board(&b[e]) {
+                winning_boards[e] = true;
+                if winning_boards.iter().filter(|v| !*v).count() == 0 {
+                    return (i, get_sum_unmarked_numbers(&b[e]));
+                }
+            }
+        }
+    }
+    return (0, 0);
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args.iter().skip(1) {
+        let i = read_input(&arg);
+        let d = get_drawn_numbers(&i);
+        let b = get_bingo_boards(&d.1);
+        let w = win_bingo(d.0.clone(), &mut b.clone());
+        let l = lose_bingo(d.0, &mut b.clone());
+        println!("[{}]", arg);
+        println!("\tPart 1: {} x {} = {}", w.0, w.1, w.0 * w.1);
+        println!("\tPart 2: {} x {} = {}", l.0, l.1, l.0 * l.1);
+    }
+}
+