Cella: Heyawake Puzzle

Cella is a Heyawake puzzle — the name means "divided rooms" — for players who like unhurried, honest logic.

The grid is cut into rooms, and some rooms carry a number. That number is exactly how many of the room's cells you fill. Two filled cells never touch side by side. Everything you leave empty forms one single connected area — and no straight line of empty cells may run through more than two rooms. Tap a cell to fill it; press and hold to mark it empty.

HINTS THAT EXPLAIN
The hint button shows the next step the board allows, and tells you which idea it used.

LEARN IT BY PLAYING IT
Heyawake's last rule is about neither a single cell nor a single room, and no sentence in a rulebook makes it obvious. The walkthrough hands you real positions and asks for the one square that follows, then shows you why. No board in it was made up — each is a genuine puzzle stopped at the moment the idea it teaches becomes the forced next move.

THREE WAYS TO PLAY, ALL OFFLINE
• 12 campaign chapters, from gentle openings to genuine work
• A daily puzzle, the same one for every player worldwide, with a gentle Monday and a demanding Sunday
• Endless mode in four difficulties: Easy, Medium, Hard, Expert

MEASURED IN MONTHS, NOT STREAKS
Fill in every day of a calendar month and the month earns its own trophy. There is no streak to lose: a day you missed can still be filled in from the archive, so a week away from the game costs you nothing.

BUILT TO BE PLEASANT
• Warm Material 3 design, light and dark, following your system colours
• Completely offline — no account, no sign-in, no network needed
• Boards shaped for a phone held in one hand
• No countdowns you did not ask for and no interruptions

27 languages supported. No account required. Pure logic.