The online retailer explains Catherine’s action part is deep, but has simple controls. Players control Vincent in thrilling scenes as he avoids traps and runs from mysterious monster attacks below. The goal is to survive by getting Vincent to the top. Every evening (game time) players see the nightmare part of Catherine.
Over on the official site, Atlus mentions Catherine has multiple endings. The way the love triangle unfolds depends on the player. Vincent has two lovers, Katherine who knows Vincent likes two lumps of sugar in his coffee or Catherine who asks Vincent if he would rather die or be killed.