You play a Hero (White Disk) in a maze trying to avoid a Monster (Black Disk).Also in the maze are a number of magic Shields (Yin-Yang symbols). If you capture all of the magic Shields you become invincible and you win. If the Monster captures you, you lose.
 
The Hero moves one empty space in any orthogonal direction. The Hero must land on a Shield to capture it. The Hero cannot move onto a Monster or a Wall. The Hero cannot pass the turn.
 
The Monster MUST move one space horizontally toward the hero if not blocked; othewise it MUST move one space vertically toward the hero if not blocked; otherwise it MUST wait (pass the turn). Then the Monster takes a Second Turn before the Hero gets his one turn. The Monster must move onto the Hero to capture him. The Monster cannot move onto a Shield or a Wall.
 
Monster Maze was inspired by Robert Abbott's Minotaur Maze, but there are several differences: it has several shields as targets instead of one exit, it has block-walls instead of line-walls (topologically different!), and its Hero cannot pass the turn. Also note that the shields serve as temporary walls until they are captured.