Their visibility is controlled by JavaScript, triggered by clicking on an array of transparent buttons overlaid on top of the puzzle board. The total number of PDF Layers is thus 4 x 4 x 15 = 240.
The picture is split into 15 tiles, stacked upon each other for every cell of the puzzle board, each on an individual PDF Layer.
This is a non-trivial game with user interaction, based on PDF Layers (OCGs, package ocgx2). (Acrobat Reader required pdflatex or lualatex)
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