As of writing this, you've got around 24 hours left to claim Book of Demons as a free game over on GOG. A hack-and-slash dungeon crawler in the vein of Diablo, Path of Exile, and Last Epoch, Book of Demons also adds some light card deck elements to its paper-inspired visuals, while a unique system lets you set the size of your quests as well.
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New games: Book of Demons mixes deck building with dungeon crawling