If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Throw darts at the targets. Hit closer to the center for more points, and don’t hurt the poor fellow. Click the mouse to shoot a dart. If the dart lands on a target you get points. The closer to the center you are the more points you get. When throwing take into account the time it takes for the dart to travel. Shoot ahead of the targets!