Who is behind the games
The publisher of record is Stoneridge Construction (Midlands) Ltd, registered in England at 23 Wentworth Road, Birmingham B17 9SH. Ginny Owen answers for what goes out under it.
A construction company with a puzzle game on Google Play is an unusual line on a listing, so it is stated here plainly rather than left to be discovered: the company is the legal publisher, and the games are its own work.
How they are made
One at a time, and small enough that a single person can hold all of one in mind at once. Designed, drawn, built and released here, then kept in repair instead of being abandoned for the next idea.
Nothing is wired up to anything
What a game needs to remember is written into its own private storage on the handset, which Android keeps out of reach of every other app installed. No account is created, no identifier is issued, no event is counted anywhere, and no advertising library is built into the package.
A game with nothing behind it cannot lose a database it never had, cannot be sold together with a list of players, and will still open on a handset years from now. The cost is that progress sits on the phone alone — which is worth knowing before the phone is replaced, not after.
Constella
com.starlace.constella
A quiet puzzle played across the night sky. A level scatters a field of stars and tells you how many lines each one carries; from those numbers you draw the links until a hidden figure comes out of the dark.
The logic is real — every puzzle has one solution, lines are checked against it, and stars and clues brighten as they are satisfied, so you always know where you stand. Drag between stars to join them, tap to undo. Dozens of hand-built charts run from simple shapes to intricate figures across easy, medium and hard, with progress kept, a hint that reveals one true line when a chart locks up, and a free-draw mode for tracing patterns of your own. It runs offline, with no account and no advertising.
Constella on Google PlayCould these clue numbers describe any picture at all?
The clues are a list of small numbers — how many lines each star carries — and that list is what a mathematician calls a degree sequence. Two things decide whether such a list could ever be drawn. The first is the handshake lemma: every line has two ends, so the numbers must add to something even, and half of all possible lists fail on that alone. The second is subtler and is the Erdős–Gallai condition, which says that for every k, the k greediest stars can absorb at most k(k−1) + Σ min(dᵢ, k) line-ends between them. Lists that pass the first test and fail the second look entirely reasonable and cannot be drawn by anyone. The panel walks every possible list for the size you choose and counts them exactly.
134,217,728possible lists of clue numbers
50.00%survive the handshake lemma
53.4%of those survivors still cannot be drawn
23.3%of all lists describe a real picture
30,016pictures fit if every star carries two lines
8lines the busiest star could honestly carry
Not on this bench: no sky, no stars, no lines and no chart. It never draws a figure and could not tell you which one is hiding — it only decides whether a list of numbers is worth anybody's evening, and counts how many different pictures a list that passes could still mean.