diff --git a/README.md b/README.md
index cb647b3..3981ebf 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ We encourage you to share your progress and ask questions in the Discussions sec
 | Day #23       | [The Dining Philosophers](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-23_The-Dining_Philosophers)               | :white_check_mark:      |
 | Day #24       | [The Josephus Problem](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-24_The-Josephus-Problem)                  | :white_check_mark:      |
 | Day #25       | [Coin Trouble](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-25_Coin-Trouble)                          | :white_check_mark:      |
-| Day #26       | [Briefcase Lock](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-26_Briefcase-Lock)                        | :white_large_square:      |
+| Day #26       | [Briefcase Lock](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-26_Briefcase-Lock)                        | :white_check_mark:      |
 | Day #27       | [Task Scheduler](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-27_Task-Scheduler)                        | :white_large_square:      |
 | Day #28       | [Word Search](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-28_Word-Search)                           | :white_large_square:      |
 | Day #29       | [Traffic Light Checker](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-29_Traffic-Light-Checker)                 | :white_large_square:      |
diff --git a/Week-04/Day-26_Briefcase-Lock/day26/Cargo.toml b/Week-04/Day-26_Briefcase-Lock/day26/Cargo.toml
new file mode 100644
index 0000000..95c7115
--- /dev/null
+++ b/Week-04/Day-26_Briefcase-Lock/day26/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day26"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/Week-04/Day-26_Briefcase-Lock/day26/src/lib.rs b/Week-04/Day-26_Briefcase-Lock/day26/src/lib.rs
new file mode 100644
index 0000000..5632f4a
--- /dev/null
+++ b/Week-04/Day-26_Briefcase-Lock/day26/src/lib.rs
@@ -0,0 +1,13 @@
+pub fn min_turns(current_lock: &str, target_lock: &str) -> u8 {
+    let mut result = 0;
+
+    for (i, c) in current_lock.bytes().enumerate() {
+        let tl = target_lock.as_bytes()[i];
+        result += std::cmp::min(
+            (10 + (c - b'0') - (tl - b'0')) % 10,
+            (10 + (tl - b'0') - (c - b'0')) % 10,
+        );
+    }
+
+    result
+}
diff --git a/Week-04/Day-26_Briefcase-Lock/day26/src/main.rs b/Week-04/Day-26_Briefcase-Lock/day26/src/main.rs
new file mode 100644
index 0000000..1c12348
--- /dev/null
+++ b/Week-04/Day-26_Briefcase-Lock/day26/src/main.rs
@@ -0,0 +1,24 @@
+use std::io::{self, Write};
+
+use day26::min_turns;
+
+fn read_lock(request: &str) -> String {
+    let mut buffer = String::new();
+
+    print!("{}", request);
+    io::stdout().flush().expect("Failed to flush");
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Failed to read line");
+
+    buffer.trim().to_owned()
+}
+
+fn main() {
+    let current_lock = read_lock("Insert the current lock: ");
+    let target_lock = read_lock("Insert the target lock: ");
+
+    let result = min_turns(&current_lock, &target_lock);
+    println!("The minimum number of turns required is {}", result);
+}
diff --git a/Week-04/Day-26_Briefcase-Lock/day26/tests/examples.rs b/Week-04/Day-26_Briefcase-Lock/day26/tests/examples.rs
new file mode 100644
index 0000000..08417af
--- /dev/null
+++ b/Week-04/Day-26_Briefcase-Lock/day26/tests/examples.rs
@@ -0,0 +1,19 @@
+#[cfg(test)]
+mod examples {
+    use day26::min_turns;
+
+    #[test]
+    fn example1() {
+        assert_eq!(min_turns("4089", "5672"), 9);
+    }
+
+    #[test]
+    fn example2() {
+        assert_eq!(min_turns("1111", "1100"), 2);
+    }
+
+    #[test]
+    fn example3() {
+        assert_eq!(min_turns("2391", "4984"), 10);
+    }
+}