Stelline: Star Battle-style puzzles, each proven to have one solution

A calm Star Battle-style logic game for iPhone. Every board is generated on the phone and proven by an on-device solver to have exactly one solution, so play is unlimited and works fully offline. A deduction engine grades each board and explains hints one logical step at a time. No ads, no account, nothing leaves your phone. USD 1.99, paid once.

Hello Product Hunt. I am an independent developer (Andelis Studio, a one-person studio) and Stelline is my Star Battle-style puzzle game for iPhone: one queen, or two stars, in every row, column and region, and no two touching.

What is different: nothing comes from a server. Boards are generated on the phone, an exact solver proves each one has exactly one solution before you see it, and a seventeen-technique deduction engine grades it and powers hints that teach the next logical step instead of giving the answer. Unlimited boards, fully offline. No ads, no account, no network code; Game Center is optional and off by default.

There is a shared daily board, board links you can send to a friend (they open in any browser), full VoiceOver support and a colour-blind mode. Version 1.3 added German, Spanish, French, Italian, Japanese and Brazilian Portuguese.

USD 1.99, paid once.

Press kit: https://stelline.page/press/

Questions about the generator or the solver are welcome.

Now on Android too: since 2 October Stelline is on Google Play, the same game on the same engine, so Today's board is the same board on iPhone and Android. Free on Google Play from 3 October to 16 October, then USD 1.99, paid once.

https://play.google.com/store/apps/details?id=studio.andelis.stelline