diff --git a/lib/mars_rover.dart b/lib/mars_rover.dart
index 2acdf8c..f26f722 100644
--- a/lib/mars_rover.dart
+++ b/lib/mars_rover.dart
@@ -4,4 +4,14 @@ class Rover {
   String direction;
 
   Rover({required this.x, required this.y, required this.direction});
+
+  void turnLeft() {
+    const leftTurns = {
+      'N': 'W',
+      'W': 'S',
+      'S': 'E',
+      'E': 'N',
+    };
+    direction = leftTurns[direction]!;
+  }
 }