Gibbous: A Cthulhu Adventure is a comedic point-and-click adventure set in a Lovecraftian world, following a librarian, his suddenly talking cat, and a private detective as they stumble into a cosmic horror mystery.

Classic adventure-game puzzle solving is paired with a lighter, humorous tone than most Cthulhu Mythos stories, as the mismatched trio explores eerie locations while trading witty banter along the way.