Gyroscope is an action video game published by Melbourne House in 1985 for a number of home computers. It is based on the Atari arcade game Marble Madness. In fact, Melbourne House would go on to publish the official Atari ports of Marble Madness (DeLuxe Edition) for the ZX Spectrum and Amstrad CPC but these were entirely new versions, unconnected to Gyroscope (being coded by John F. Cain rather than the Catalyst Coders).