To play the game, use the arrow keys on your keyboard to move your character around the level. You can climb up blocks, but you can only climb one block at a time. Each block color corresponds to a number, 1, 2, 3, or 4. Press the corresponding number on your keyboard to make blocks of that color disappear or reappear. Your goal is to navigate through the level and reach the door while avoiding the falling water. Use the block disappearing and reappearing ability to your advantage to find a path to the door and complete the level.