Logic puzzle

Akari (Light Up), known in Japan as Bijutsukan (art gallery), is a logic puzzle where you place bulbs in white cells to illuminate the grid. Number clues on bla...

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Nurikabe uses an island-and-sea metaphor: numbered white islands must reach the correct size, separated by a single connected black sea. No 2×2 black blocks all...

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Slitherlink (also Fences) is a loop puzzle on a dot grid. Numbers in cells tell you how many of that cell's four edges belong to the loop. Draw a single closed...

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Masyu (Pearl Necklace) is a loop puzzle with white and black pearl constraints. White pearls: straight through, turn in an adjacent cell. Black pearls: turn in...

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Hashiwokakero (Bridges, Hashi) connects numbered islands with bridges. Each island must have as many bridge connections as its number. Bridges cannot cross; at...

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Shikaku (Divide by Box) partitions the grid into rectangles. Each rectangle contains one number equal to its area. Factorisation determines shape options—prime...

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Hitori ("leave me alone") shades cells until each number is alone in its row and column. No two shaded cells touch; all unshaded cells form one connected region...

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Kakuro (Cross Sums) uses a crossword grid with number sums instead of words. Digits 1–9, no repeats per block. Second only to Sudoku in Japan. Pure logic—arithm...

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Numberlink connects matching pairs with non-crossing paths. Fill every cell. Known digitally as Flow Free—one of the most downloaded puzzle apps ever. Spatial a...

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Fillomino fills every cell so regions of orthogonally connected cells equal their number. Regions of equal size never touch. No region boundary is given—you inf...

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Yajilin (Arrow Ring) combines arrow clues (counting black cells) with loop logic. Each clue counts black cells in a direction; draw a loop through all non-clue,...

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