Colour triangles in some squares so that the remaining white space are all shaped like rectangles. The triangles have to split a square into two equal size rightangled triangles. The numbers in the black squares indicate how many of the four adjacent squares are to be coloured with a triangle.
Apologies for the self-promotion, but I thought this might be relevant here. I've created an app that generates Shakashaka puzzles. It's got seven different board sizes and three difficulty levels, with endless puzzles. Give it a try if you like! :) 👉
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