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Kaku is a relaxing logic puzzle based on the classic Shikaku (rectangle division). Split the grid into rectangles so that each rectangle contains exactly one number — and that number equals its size. 2,000 handcrafted levels across 4 difficulties, daily challenges with monthly trophies, and an IQ score that grows with every puzzle you solve. Easy to learn, but Expert 13×13 boards will truly test your logic.