●Cheshi is added because the Mattis synthetic screen lacks location.
●The stone cutting machine has something similar to a gear, but the synthesis does not require the use of gears.
●Cheshi cannot be placed on top of another Cheshi, so that they overlap only by placing another square on top, then putting a stone cutting machine on it, breaking the box, and then putting one under it.
●Whether this trait is intentional or a game loophole is not known at the moment. Although diamonds, emeralds, hardened clay and other items are also very hard, but do not need to cut the stone machine to deal with.