One Line: Number Path Puzzle

One rule, endless depth. Every board is auto-generated and guaranteed solvable. Streaks and best times to keep your mind a little sharper each day.

One line. Every square. A clean, surprisingly deep one-stroke puzzle: just trace the numbers in order, 1 → 2 → 3. A fresh “daily puzzle” turns spare minutes into the perfect little brain break.

■ Simple to play

• Start your line at ①
• Pass the numbers in order: ① → ② → ③ …
• Cover every open square exactly once (dark blocks are walls)
• Finish on the last number. Just drag — rub back to erase

■ Why you’ll like it

• Always fair: every board is checked by a real solver, so there’s exactly one solution — never guesswork
• Endless: auto-generated boards, so no two puzzles feel the same
• Four difficulties: gentle 6×6, 7×7, hard 8×8, and a fiendish 8×8
• Track progress: clears, streak, best times, no-hint rate
• Works offline

■ Made for you if…

• You want a quick, satisfying “solved!” in a spare moment
• You love logic puzzles but hate unfair, ambiguous ones
• You’d like a small daily habit to keep your mind moving
• You appreciate a clean, grown-up design

■ Private by design

• No account, no sign-in
• Your stats stay on your device — nothing is sent to a server