A sudoku journey
around the world.
Solve puzzles, open new regions on your travel map, and collect postcards along the way.
What makes it different? ↓Your puzzles become a journey.
Every puzzle you solve moves you along a route around the world — 6 regions, 20 stages each. Difficulty grows by real solving techniques, not random number counts.
Solve. Collect. Color.
Landmark stages award postcards as line art. Keep earning stars in a region and each postcard fills with color — up to a gold-foil finish.
CLEARED 7-DAY
STREAK
Hints that teach, not tell.
Smart Hint reveals in three steps — where to look, which technique applies, and only then the answer. Read explanations and diagrams for 12 techniques in the Academy.
This is what the app looks like.
A travel journal, carried into the app — resume from home in three seconds, open the next region on the map, and browse the postcards you have collected.
Back in the puzzle in three seconds.
Open the app and the resume card sits at the top — with the daily puzzle and your progress in the current region on the same screen.
Pick a cell and the path shows itself.
Its row, column and box light up along with every matching number. Undo, erase, notes and hints sit right under the board.
Make it your own.
Choose light, dark or high-contrast themes, then collect new palettes as you travel. Preview and apply them from your album.
Every postcard you have earned.
They arrive as line art and fill with color as you collect stars. Filter by region, and see what it takes to open the ones still empty.
One puzzle a day, one stamp.
The monthly calendar shows each day's difficulty. Missed days can be played retroactively, and shields keep a streak alive.
Where the techniques are taught.
Open Stats, then Academy to browse 12 solving techniques. Tap a technique to read its explanation and diagram; every entry is available from the start.
One hint. A clearer path.
Start with where to look, then take it one step at a time. Follow the highlighted cells and explanation to find your next move.
One puzzle. New horizons.
Begin in Lisbon and move through the stages. Collect stars to open the next region and earn postcards at landmarks.
Everything opens
by playing.
No difficulty, theme or collectible sits behind a gate. Solve puzzles and they open in turn.
- All 6 difficulties
- Every theme
- Unlimited hints
- Unlimited undo
- All collectibles
- Offline play
- 18 languages
Small things, done kindly.
One-hand mode
Board and pad shift to your thumb — left or right.
Dark mode
True dark board, tuned for night solving.
Fully offline
Planes, subways, mountains — everything works.
18 languages
Fully localized, layouts included.
Home widgets
Daily puzzle, streak compass and resume — on your launcher.
Auto-save, every move
Leave anytime. Your board is exactly where you left it.
Before you ask.
More answers — including backup and device transfer — on the support page.
What is locked?
Every difficulty, theme, hint and collectible opens by playing. Nothing gates your progress.
Does it work without internet?
Yes. Puzzle generation and your records are handled on device, so airplane mode changes nothing.
Which devices are supported?
Android 8.0 and above, iOS 15 and above.
Does progress sync between iOS and Android?
No. There is no account, so nothing syncs automatically. Move a backup file across instead.
Can I move my progress to a new phone?
Export a backup in Settings and import it on the new device. There is no automatic backup, so export before you switch.
Do puzzles always have one solution?
Yes. Every puzzle is verified for a unique solution when it is generated.
Where do I report a problem?
Email us at h1.soft.x001@gmail.com.
Your voyage starts
with one puzzle.
iOS & Android · works offline · no account needed