I'm talking about the kind of puzzle where finding out the solution only makes you more mad at how arbitrary it was. Broken Sword had the infamous goat puzzle, Gabriel Knight 3 had the cat hair mustache puzzle. If your adventure game puzzle has an entire Wikipedia page devoted to it, it's probably not for a good reason, yeah? Other obvious contenders include the babel fish in Hitchhiker's Guide to the Galaxy, the custard pie in King's Quest 5, the custard toilet in Discworld (don't ask), and everything from our list of the 10 worst and most WTF puzzles in adventure gaming.What's the most frustrating puzzle you ever got stuck on?Here are our answers, plus some from our forum.