ENI Puzzle - Black & WhiteOne out of the series of ENI-puzzles. This is identical to the mini-version with eight layers but with only two colours.
ENI Puzzle - BrailleOne out of the series of ENI-puzzles. This is the version with five layers and braille symbols.
ENI Puzzle - MiniOne out of the series of ENI-puzzles. This is the version with eight layers.
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