HELLCARD is a cooperative roguelike deckbuilder set in the paper dungeons associated with Book of Demons. Its battles pit heroes against the Archdemon’s hordes, with deckbuilding and fast-paced tactical card play at the center. The setting gives the adventure a storybook-like frame, while its combat asks players to make decisions through cards rather than treating the dungeon as mere scenery.
A defining twist is that monster placement matters: enemies’ positions can be used to a player’s advantage, making the layout part of tactical planning. The game supports solo dungeon runs, with the option to recruit computer-controlled companions, as well as multiplayer battles where friends or strangers can join. Co-op brings together up to three heroes, giving the encounter a shared-party format rather than making every run a solitary card challenge.
Its origins as a planned game mode in the Book of Demons universe also help explain its focused identity as a standalone spin-off, built around tactical card encounters in that established paper-dungeon setting.
