If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
It's easy to learn, yet difficult to master. Can you get to the top of mountain and knock that cackling Billy Goat off? Good luck. Drag the cards to your hand to get rid of all the cards on the mountain. The value of the card you drag must be one greater or one less than the card in your hand.
This game is played with mouse only.