Shakashaka Puzzles - 200 Hard to Very Hard Puzzles 9x9 vol.2 - Liam Parker - Bog

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.Each triangle must occupy exactly half of its cell, but may be in one of four orientations.A number in a black cell indicates how many triangles are adjacent to that cell by sides.