Rip's Expedition Team: Hospital 666

Rip, Pompo, Lulu, and Popo, four explorers, are lost in a 666-story infinitely looping hospital. The way to escape is similar to 'Exit 8'. On each floor, you need to observe your surroundings and determine if there are any 'abnormal phenomena' (like ghosts, strange marks on the walls, light changes, etc.). If you find an anomaly on a floor after exiting the elevator, immediately turn back and take the same elevator you came in on to go up. If the floor has no anomalies, take the elevator on the opposite side to go up. This continues until you defeat the boss on the 666th floor.