Puzzles for Brain Shakashaka - 200 Hard to Expert 10x10 vol. 4 in Bloomington, MN

Shakashaka is a logic puzzle developed by publisher Nikoli. The objective is to fill the white squares in a given grid with a pattern of triangles such that each white area in the resulting grid has a rectangular shape. Furthermore, each black square in the grid marked with a number must be orthogonally adjacent to the specified number of triangles.