If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You control the team of players wearing red jackets. Your objective is to knock out all players on the opposing team (green) by throwing snowballs at them. When a player is hit with a snowball, they are temporarily stunned and can't be controlled until they recover. A player is eliminated when they are hit with a snowball three times.
Left click on one of your players and hold to drag player/set power of throw. Release the left mouse button to position player and throw the snowball.