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This is a shaka/shawaka puzzle. Place black triangles in some white cells within the grid – shaped by dividing a cell diagonally and portray one aspect black – so that every remaining white space kinds the form of a tromino (a chunk made up of three squares in both an I or L form). The white space could be any dimension, so long as its proportions precisely match both an I or L tromino. Numbers in black cells point out what number of triangles in whole are within the cells orthogonally adjoining to that quantity cell.
TL;DR Shakashaka however the purpose is forming trominoes as a substitute of rectangles.
Penpa+ hyperlink. Select Composite → Paint → Shakashaka for the proper enter mode.
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