Try and become King of the Sandcastles! Flatten all the sandcastles on the pyramid by using the arrow keys.
Watch out for enemies: the beachball brothers, the frog, the flea, and the evil Dr. Flatten are all after you. Keep an eye out for friendly Tick-Tock clock - if you land on the same block as him, he'll make sure no enemies appear for a while! If you get into trouble on the edges of the pyramid, you can use the buckets as a quick escape route.
(You can toggle the music on and off by pressing "M", and toggle the sound effects using "S". Use "P" to pause and unpause the game.)