Though the hero in Skipmore's Mamono Slayer may wield a sword, the game is essentially a collection of lock and key puzzles designed to prevent the player from finding the legendary blade that will save the kingdom. The act of attacking enemies involve pointing your weapon at them as they walk towards the knight, and you can access your inventory by pressing the space key at any time. The castle also acts as a place of healing, since returning to it will restore any hearts lost while you are exploring the deeper dungeons.

Mamono Slayer is a short game that shouldn't take longer than ten or fifteen minutes to play from start to end.