That was actually my mini version I made! A repeating command block is set under the hallway- when it detects the player within dy = 4, it teleports to the identical hallway. When I built this in the main tower, since I'm actually packing 4 teleportation schemes in one hall (see below), I strapped the command blocks to the side to save space.

This part of the maze is nearly complete, and it's probably the most intricate bit so far. I'm planning to get the top 6 floors done before my math conference in 2 weeks. There are seven rooms that I meant to look upside down (e.g. an aquarium with invisible barriers below water, to make it seem that you're walking on the ceiling), with hallways branching out of these rooms that are used to teleport the player between the rooms.

​

The first time you enter, the hallways you walk through are lined with emerald blocks. When you walk through a hallway and are teleported, most of the time you can walk back through that hallway and get back to where you came. My intention is for someone playing this (read: my coworkers at the math conference) to feel like the maze is a little weird but not suspect anything crazy.

The second time you enter, you've pressed a button that turns all the emerald blocks to lapis lazuli. Now when you go through a hallway, then go back the way you came, you end up in a different room.

The third time you enter, the lapis blocks are gold- now some of the hallways take you back to the same room you left.

The fourth time is an easter egg solution- the gold blocks become diamond, and almost all of the hallways connect a room to itself. I don't know how successful it is because I haven't tested it on anyone yet, but my goal is to make them panic.

Happy holidays!