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Shakashaka (308)
Other names: ShakaShaka
Instruction:
Fill in some white cells with black triangles (no more than one black triangle per cell) so that all remaining white areas in the grid are composed of rectangles. (All squares are rectangles.) Each black triangle occupies exactly half of its cell (and may touch other black triangles in other cells). A white rectangle may occupy multiple cells but may not share part of an edge with another white rectangle (it is permissible for a corner of a white rectangle to touch an edge or a corner of another white rectangle). Some black cells contain numbers; those cells must touch that number of black triangles along an edge.