Gyromite is perfectly playable, and some may argue better, without using ROB the Robot. You can push the pillars up and down using a second NES controller while the first controller commands Professor Hector as it would in ROB play, making the game either into a faster-paced co-op platformer for two players, or an unconventional two-controller game for one player in a similar manner to Atari's Raiders of the Lost Ark. This technique cannot be performed on Stack-Up.