Helltaker is a short, free puzzle game about an unassuming man who decides he wants a harem of demon girlfriends and pushes sliding-block puzzles to recruit them one by one from Hell. Its brief length, comedic tone, and instantly memeable demon-girl cast made it a viral hit far beyond what its small scope would suggest. Helltaker hentai doujinshi are disproportionately popular relative to the game's short length.