Here you can try your hand at a fun game. To start, click on the button in the lower right hand corner. Use up and down arrows to adjust the projectile's angle, and left-click to fire. (Hint: Your projectile has a better chance of hitting its target when you have sufficient power, as indicated by the moving bar at the bottom of the game.
Go here for a game index - you're on your own in trying to figure out how to play these :)