The game is set outside, appearing two funny creatures: a "wiggly" worm and a "curly" caterpillar. On the sides there are row of buttons where you press buttons to guess which the sand/gravel moves down and dings.
To play the game, players should reshuffle the sand/gravel to different lines of the worm/caterpillar. Then both players go to the front and guess where the sand/gravel will move down to the bottom. If they hear a ding, it means it is correct and then proceed to the next column. If they didn't hear a ding, it means you are incorrect and turn proceeds to the opponent. The first person who reaches the end is the winner.
The game doesn't work anymore after the update that changed the way pistons work. Instead of the piston pushing only one block, the new piston pushes two adjacent blocks forward, making the gravel/sand unable to fall down. Because of this, Stampy never shown the new pointing system for the game.
The game ranked #4 in Stampy's Top 10 Broken Mini-games.
This game was most likely named after a giant sea monster that Stampy and Squid found while playing the Forgotten Vale adventure map, that they refer to as a "Wiggly Worm".
Unlike most of the games in the Funland (except Switch the Switch), the redstone is shown so the sand/gravel can drop down to the block and signaling the redstone to the ding.