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And the other tiles (the chains in the bottom left)?  It's just trying to import directly into my own little game engine, essentially requires edge cases. If “Bonus” isn't tiles, then on the “mask” sheet it should be blank (alpha) in that region.

In trying to read the tile set into a game, I found that the mask was broken in places.  The chain tiles in the bottom left haven't got perfect square masks and the Bonus text… is that supposed to be part of the tile set, if so, make the mask fit it.