I am interested in mazes that can be adapted to require two or more people to cooperate to solve. Some examples include Robert Abbott's Meteor Storm and Valentine's Day, as well as Oskar van Deventer's Counter-Step Maze and his three dimensional mazes broken into three planes. Do you have any other ideas?
Great set of ideas. I enjoyed the Valentine's puzzle link. Many of Oscar's puzzles are implemented on Andrea Gilbert's website clickmazes.com.
The example that springs to mind is the (excellent) Hanayama Labrinth. I guess similar conceptually to the three dimensional maze projected on three faces, but with only two faces, so the pair analogy is easier to see.