Oo-Topos is an interactive fiction game published by Sentient Software in 1981 for the Apple II. In 1986 it was re-released by Polarware for additional systems and with graphical depictions of scenes described by the game's text. The graphics were designed using Penguin Software's Graphics Magician.

The pilot of a space vessel is carrying important cargo vital to the survival of humanity. The pilot is attacked by space pirates and forced to land on the planet Oo-Topos. After landing the pilot is captured and imprisoned in a fortress on the alien world. The pilot must escape confinement, retrieve the precious cargo taken from the crashed ship and get off Oo-Topos with it in order to save the human race from extinction.