Blocks fall from the top of the screen. Use the arrow or WASD keys to position them. Presents will combine when they touch another present of the same color. When you have three or more of the same color touching. Click them with the mouse to remove them. Use the mouse to swap individual presents. Bigger presents and longer chains will give more points. Removing presents increases your power bar. If you have enough, hold down space bar to stop the falling blocks or use a bomb to destroy a group of presents.