Fire colored balls at the enemy, taking care to see that the color of the ball and that of the enemy are the same.
Click one of the six colored buttons to load a colored ball in the gun. The color of this ball must be the same as the color of the enemy. Move the cursor using the arrow keys. Press the space bar to fire the colored ball at the enemy and kill it. If the enemy hits the gun the game ends. Continue playing the game till you lose.