Monstrum is a first-person survival horror game set aboard a derelict cargo ship whose layout is procedurally rearranged on every run, stalked by one of several relentless creatures. There's no memorizing a safe route.

With no way to fight back, survival depends on stealth, hiding, improvised distractions, and scavenging the tools needed to escape before the monster catches you. Permadeath makes every attempt tense, and each new run brings a different layout to learn.