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Slitherlink (1989) — Loop-Closing Logic Born From a Two-Player Paper Game
In June 1989, barely half a year into the Heisei era, Puzzle Communication Nikoli #26 introduced a new puzzle format. Adapted from a two-player paper game called Slither into a single-player pencil puzzle, Slitherlink offers a paradoxical solving pleasure — proving where lines cannot go rather than where they can — and carries a nearly 38-year lineage running through NP-completeness proofs to Steam storefronts in the 2020s. We trace, with sources, the loop-logic Nikoli founder Maki Kaji once called "the son of Sudoku."
Simon Tatham's Portable Puzzle Collection (2004) — 40 Puzzles, Freshly Generated for 22 Years
In 2004, British engineer Simon Tatham — also known as the author of PuTTY — released a free collection of single-player logic puzzles. From Sudoku and Minesweeper to the loop-drawing Loopy and the bridge-building Bridges, all 40 puzzles are freshly generated by computer on every run. Written purely to solve a portability annoyance, this hobby project became, twenty years later, the foundation of an AI algorithmic-reasoning benchmark.
