Steam playtest
Grimoire of Monsters
A signup control was found on 2026-10-29 09:10. Admission is decided by the developer.
Participation is not guaranteed — access to a playtest is allocated by the developer and the rules can change. How it works · Voluntary support for the site
Co-op bullet heaven for 1-5 players with a twist: one player controls the monsters. Survive the hordes together, or become the Grimoire Master, spawn the swarm, and turn the bosses on your friends. Which side are you on?
What a Steam playtest is
A playtest is a test build of a game that developers offer before release. On Steam you sign up for testing on the game's page. Whether you get access immediately, or the developer invites you first, is decided by the developer and can change.
More games with a playtest
This game is part of the Playtest Atlas overview — 3645 games in the catalogue.