Shoot the ragdoll with the cannon to hit the mark and pass to next level. In this third version of the game, the 'here' placard marks the position of the target to hit. With 50 levels of increasing difficulty, and when you start only 3 of them are enabled.
Move the mouse pointer to aim (if the mouse pointer is away the shot will be stronger; and the direction depends on its position). When you hit the mark, a 'next level' tinkling poster will be visible on top: click on it to continue.