One Line: Number Path Puzzle

One line. Every square. A calm, surprisingly deep path puzzle: trace the numbers in order — 1, 2, 3 — and fill the whole grid with a single stroke. A fresh daily puzzle turns spare minutes into the perfect little brain break. ■ How to play • Start your line at 1 • Pass the numbers in order: 1 → 2 → 3 … • Visit every open square exactly once (dark blocks are walls) • Finish on the last number. Drag back to erase, or touch any point on your line to redraw from there ■ Why you'll like it • Always fair: every board is checked by a solver, so there is exactly one solution — no guessing • Endless boards: puzzles are generated on your device and prepared in advance, so there's no waiting • Daily puzzle: the same board for everyone each day — build your streak • Four difficulties: gentle 6×6, 7×7, hard 8×8 and a fiendish 8×8 • Ranks: climb from Novice to Grandmaster; harder boards count for more • Progress: clears, streaks, best times and no-hint rate • Dark mode, in English and Japanese ■ Made for you if… • You want a quick, satisfying "solved!" on a commute or coffee break • You love logic puzzles but dislike ambiguous ones • You'd like a small daily habit that keeps your mind moving • You prefer a clean, quiet, grown-up design ■ Good to know • Free to start. No subscriptions • No third-party ads • Your records stay on your device ■ Privacy • No account or sign-in • Puzzles are generated and played offline • The only network use is reading public App Store information to show other apps from the same developer • No tracking