KeyClue is an annual puzzlehunt/ARG played by Engineers at the University of Calgary. Departments compete to find a key hidden somewhere in the City - solving puzzles and unwinding the story as they go. Any team that finds the key must replace it with a false one, so no team can be sure if they won until it's officially over.

I played a lot of KeyClue in my undergrad, and this year I was involved in its development.