If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you are a pig called Wilbur. You are rolling down the hill in a carriage. What you need to do it to avoid obstacles and catch power ups and bonuses.
Up Arrow Key - Jump over low obstacle.
Down Arrow Key - Crouch.
Left Arrow Key - Jump over medium height obstacle / grab power ups.