Play Mysterium (Japan edition · Japanese) Online

An apprentice alchemist enters a first-person maze and must turn found materials into the tools needed to escape. Fire, water, acid and mercury transform objects in consistent ways, so reading clues and remembering recipes matters as much as mapping corridors. Keys, weapons and protective items must be readied to work. Monsters interrupt the investigation, and an aiming mode lets you direct weapon fire along a hall without changing the route you are exploring. Start and read Morda’s introduction. In the first hall, walk to the iron and press SELECT for inventory, then A to take it. Read the scroll, drop iron into the fire pool to make a glass key, and USE it at the door. The lizard helps identify the first level’s keys.