They wouldn't be games without problems to solve, and with the sheer man-hours most gamers spend inside gaming worlds, you must all be experts at the puzzles that work and the ones that don't.
Flipping switches, moving boxes, typing in random numbers, solving riddles; which puzzles do you think go beyond the humdrum and into legend?
For fame and possible Wikigame developer uberstatus, what-are your all-time favourite puzzles in a game?