I remember starting a maze flashtease a few months back, and even started mapping it out. It was a tease where in the beginning, you choose 1, 2, or 3 for your starting location and then get teleported there. There are three separate areas, each containing a key. You need all three keys to unlock the final door.
I thought it was one of the TotMs, but I looked through all the maze ones just now and I can't find it.
