Brain Test — One Line Puzzles

Brain Test is a calm, elegant one-line drawing puzzle. Every level is a figure you must trace in a single continuous stroke — no lifting your finger, no drawing the same line twice. It's the classic "Euler path" brain teaser, beautifully redesigned.

Start with gentle shapes and work your way up. Each puzzle looks simple until you try it — then it quietly rewires how you think about lines and connections.

WHY YOU'LL LIKE IT
- Hand-crafted figures — paper plane, star, envelope, crown, fox, and more
- Endless procedurally generated puzzles after that — it never runs out
- Progressive unlocking — clear a level to open the next
- Three-star scoring — solve it flawlessly (no slips, no hints) for all three
- One-stroke mode — for purists: lift your finger and the stroke resets
- Three beautiful themes — Whiteboard, Chalkboard, and Neon
- Gentle sounds and satisfying draw-in animations
- Helpful hints when you're stuck, based on the real math behind the puzzle

RELAXING, NOT STRESSFUL
No timers forcing you (turn the timer off if you like). No ads interrupting you. No accounts, no sign-up. Just you and the puzzle.

PLAYS ANYWHERE
Fits any screen — phone or tablet — and works fully offline. Your progress is saved on your device.

Can you draw them all in one stroke?