Blog
The Zeloku blog
One topic per post, sourced and fact-checked — the history, the maths and the stories behind the puzzle. For rules and technique guides, see Learn instead.
Records
Sudoku World Records: Who's Actually the Fastest?
The real Guinness World Record (2:08.53, set in 2006), the WSC's most decorated players, and who won in 2025 — with sources.
2026-07-26 · 9 min read
Origins
The History of Sudoku
Who really invented Sudoku, and why is it called that? The real timeline — 1979 America, 1984 Japan, 2004 London — to today.
2026-07-26 · 8 min read
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