diff --git a/src/debug.rs b/src/debug.rs
index 2875452..f0b2f11 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -13,8 +13,9 @@ impl GameState for State {
         for (y, rows) in self.world.read().unwrap().data.iter().enumerate() {
             for (x, tile) in rows.iter().enumerate() {
                 match tile {
-                    crate::Tile::Robot => ctx.print(x, y, "R"),
-                    crate::Tile::Food => ctx.print(x, y, "F"),
+                    crate::Tile::Robot => ctx.print_color(x, y, RGB::from_f32(0.0, 1.0, 0.0), RGB::from_f32(0.0, 0.0, 0.0), "R"),
+                    crate::Tile::Food => ctx.print_color(x, y, RGB::from_f32(1.0, 0.0, 0.0), RGB::from_f32(0.0, 0.0, 0.0), "F"),
+                    crate::Tile::Wall => ctx.print(x, y, "#"),
                     crate::Tile::Empty => ctx.print_color(x, y, GRAY30, BLACK, "."),
                 }
             }
diff --git a/src/lib.rs b/src/lib.rs
index c76e962..8ca3f5c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,7 @@ pub mod debug;
 // Constansts that dicate the world size
 const WORLD_HEIGHT: usize = 100;
 const WORLD_WIDTH: usize = 100;
+const N_WALLS: usize = 100;
 
 /// Tile in the world, can either be a robot empty or food
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq, Debug)]
@@ -13,6 +14,7 @@ pub enum Tile {
     Robot,
     Food,
     Empty,
+    Wall,
 }
 
 /// Dictates where the robot is in the world
@@ -56,6 +58,12 @@ impl Default for World {
         let robot_y = rand::thread_rng().gen_range(1..WORLD_HEIGHT);
         data[robot_y][robot_x] = Tile::Robot;
 
+        for _ in 0..N_WALLS {
+            let wall_x = rand::thread_rng().gen_range(0..WORLD_WIDTH);
+            let wall_y = rand::thread_rng().gen_range(1..WORLD_HEIGHT);
+            data[wall_y][wall_x] = Tile::Wall;
+        }
+
         Self { data }
     }
 }
@@ -103,6 +111,10 @@ impl World {
             return Err(anyhow::anyhow!("out of bounds"));
         }
 
+        if self.data[new_x][new_y] == Tile::Wall {
+            return Err(anyhow::anyhow!("Boop, hitting a wall"));
+        }
+
         // Update
         self.data[new_y][new_x] = Tile::Robot;
         self.data[old_y][old_x] = Tile::Empty;