If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
A lot of wurmies pieces are now falling out of the sky. You can let them fall sown and disappear or you can play the game in which you are challenged to put them back together in one long piece. The game is finish when every open joint is connected to another and closed. Do not let the open joints to touch the walls.
Up / Down Arrow Keys - Rotate.
Left / Right Arrow Keys - Move.
Spacebar - Drop.