Shakashaka (シャカシャカ) 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.
- "Puzzles of nikoli.com". Nikoli. Retrieved 14 August 2014.
- "Rules of Shakashaka puzzle". Nikoli. Retrieved 14 August 2014.
- Demaine, Erik D.; Okamoto, Yoshio; Uehara, Ryuhei; Uno, Yushi (2014), "Computational complexity and an integer programming model of Shakashaka", IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E97-A (6): 1213–1219
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