This game is a pretty unique concept that's hard to explain. The object is to guide your worm ("UrthWurm") through the level, trying to avoid obstacles. The game is played using only one key: Your worm falls toward the ground unless you press the Spacebar to make it go up. (Like I said, it's hard to explain.) The graphics are pretty average, but it can be fun in short bursts, but it sometimes can very difficult.