Click Play in the lower right corner. It will only be a matter of seconds until you start to see boars running across the screen. You can shoot these boars by using your mouse to aim, and then clicking it to fire. Because boars are such a tough animal, killing them requires a headshot. If you hit their body, it will slow them down. However, you will have to then hit them with at least one more shot to take them out.
You will get 100 points for each boar that you kill. Not only do you need to take out the boars to increase your score, but not allowing any to escape is how you keep the game from ending. Your game will continue until five boars successfully elude your shot.
LEFT MOUSE CLICK: fire