Laurens writes "Despite slow sales of LittleBigPlanet in the USA, you might have heard of the calculator made within the game, but now that has been topped. I found a fully-functioning AI machine which plays Tic-Tac-Toe against the player. Considering that you can't actually program in LBP, this feat is impressive; it is a machine which has mechanical AND and OR ports made of pistons and proximity detectors, a physically moving Program Counter, and hundreds of wires. The level is called 'Tic Tac Toe' and is by author Cristel."
Another player created a similarly amazing level that is a recreation of John Conway's Game of Life