Fill & Number

Fill & Number reimagines the classic one-stroke puzzle as a modern logic challenge. Trace all panels in a single continuous line, while numbers appear to mark the touch order. Panels already numbered must be traced strictly in sequence (1→2→3…), demanding a unique optimal path and deep strategic thinking.

Features include varied panel shapes beyond squares, with unpredictable gimmicks like X and ? tiles that raise the challenge. It’s a pure logic experience—no timers, no scores—designed for daily brain training. With over 1000 levels and daily puzzles, it offers endless opportunities to sharpen your math-minded thinking on a Chrome extension you can enjoy anywhere.