If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You're a mouse! Try to get the cheese and bring it back to the mouse hole. To help you along your quest, a player among you will be chosen to be a powerful Shaman! The Shaman's objective is to help the mice get to the hole. Throughout maps that are played, shamans will be able to place objects throughout the area to guide you to the cheese and your goal.
Use the arrows to move and jump.