XOR

XOR is a puzzle maze video game developed by Astral Software for systems like the BBC Micro Archive, ZX Spectrum, and Amiga.

Players control two shields (Magus and Questor) to collect all masks in 15+ complex levels, navigating hazards like gravity-based fish and chickens, with a 2000-move limit per level. It requires careful planning to solve, as one shield may need to be sacrificed.

XOR is also a binary logical operator. It takes two values and returns true when only one input is true. In the game only one shield has to reach the exit, which references the operator’s nature.