Numberlink ナンバーリンク

Logic puzzle · 1897 / 1917 origins; Nikoli popularized in Japan · 1 player · Variable

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 and intuitive.

Rules

Connect each number pair with a path (orthogonal). Paths do not cross, branch, or overlap. In most puzzles every cell is used. Solve by logic; start from the most constrained pairs (corners, walls). Nikoli variants: Arukone (letters instead of numbers), Nanbarinku. Spatial and intuitive; no arithmetic required.

History

Numberlink has deep roots: Sam Loyd published a precursor in the Brooklyn Daily Eagle in 1897; Dudeney featured it in "Amusements in Mathematics" (1917). Nikoli popularised it in Japan. The Flow Free app (2012) brought it to billions of plays. Speedrun and puzzle communities keep it alive. Known digitally as Flow Free—one of the most downloaded puzzle apps ever.

Tips for beginners

Solve most constrained pairs first (corner-to-corner, near walls). If a path would cut another number off from its pair, it's wrong. Ensure every unused cell is reachable.

Cultural context

Flow Free one of the most downloaded puzzle apps; crossover between Nikoli print and mobile gaming; speedrunning community. Numberlink connects matching pairs with non-crossing paths; known digitally as Flow Free—billions of plays. Sam Loyd and Dudeney published precursors in the late 1800s and early 1900s; Nikoli popularised it in Japan. Available on Nikoli.com, Flow Free, and Simon Tatham's Portable Puzzle Collection. Spatial and intuitive; no arithmetic required.

Play online

Play at Nikoli.com, Flow Free (bigduckgames.com/flowfree), Simon Tatham's Portable Puzzle Collection, Puzzle-Nonograms.com. Mobile: Flow Free, Wire Storm, Numberlink apps.

Where to Buy or Play

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📱 Flow Free — free app (iOS / Android) The defining digital version of Numberlink — free to download
📖 Numberlink Puzzle Book (Nikoli) Official Nikoli numberlink / arukone collection