Tower Toppler, also known as Nebulus in some regions, is a classic 2D platform video game originally released for the Atari 7800 in 1988. The game features a unique gameplay mechanic where the player controls a small green creature named Pogo, who must ascend a series of cylindrical towers with the aim of reaching the top to disable them. Along the way, players face a variety of obstacles, enemies, and puzzles. Tower Toppler is known for its challenging levels and distinctive rotating tower effect, which was innovative for its time.