Astrella
AvailableAndroid · Free · No ads
A new Star Battle puzzle every day. Pure logic, no guessing.
Place stars on the grid: one per row, one per column and one per colour region, and they can never touch, not even diagonally. Every puzzle has a single solution you can reach by pure reasoning.
How to play
Four rules. One solution.
- 01
One per row
Every row holds exactly one star.
- 02
One per column
And so does every column.
- 03
One per region
Each colour region hides one star.
- 04
They never touch
Not side by side, not diagonally. That's the trick.
Try it here
Today's board, no download needed.
A 6×6 to warm up. In the app, boards go up to 14×14 with two or three stars per region, and you compete against other players in real time.
- Tap once for ✕, again for ★
- Drag to mark several cells with ✕
- Keyboard: arrows, S = star, X = cross
Tap a cell to mark ✕, tap again for ★. One star per row, column and colour region, and stars never touch, not even diagonally.
Solved!
0:00
There'll be another one here tomorrow. In the app: a new one every day, rankings and tournaments.
Everything inside
One puzzle a day… and a lot more.
Daily puzzle
The same board for everyone, every day. Keep your streak alive.
Ranked
Race other players on the same board and climb 8 leagues with an ELO rating.
16-player tournaments
Groups, quarters, semis and a final, with gold prizes.
The Mine
The daily gold rush: solve fast, dig deeper, cash out.
Unlimited practice
From 6×6 to 14×14, with 1, 2 or 3 stars per region.
Made for everyone
Offline play, light and dark themes, colourblind mode, English and Spanish.
Free, no ads
No banners, no videos to keep playing. Just the puzzle.
Screenshots
FAQ
Things people ask.
Is it free?
Yes, and ad-free. If you enjoy it and want to support development, you can buy me a coffee on Ko-fi or leave a review on Google Play — it helps a lot.
Do I need to be online?
The daily puzzle and practice work offline. Ranked and tournaments are played against other people, so they need a connection.
What is Star Battle?
A classic logic puzzle, a cousin of sudoku. The rules fit in one sentence and every board has a single solution you reach by reasoning, never guessing.
Can I try it without installing anything?
Yes: there's a board right here on this page, plus the full web demo.