Stelline

For iPhone · iOS 26 or later

Stelline

Star Battle-style logic puzzles, generated without end on your iPhone. Place one queen — or two stars — in every row, column and region, and never let two touch.

Every board is built on your device and verified to have exactly one solution. Easy to Hard boards are solved by the deduction engine without guessing; Expert is labelled honestly for the boards that need what-if reasoning. Boards are graded by the same engine that powers the hints. No ads, no account, no internet needed, and nothing about you is collected.

How to play

Coming to the App Store. English. iPhone only, portrait.

A look at the game

An 8 by 8 board in progress under the headline “Every board has exactly one solution”: pastel colour regions, three queens placed, dots on the cells that cannot hold one, the timer and the Hard badge above.
Tap to cycle a cell, drag to dot a whole run.
A 9 by 9 board in progress under the headline “One queen per row, column and region”: three queens placed, their rows and columns dotted.
1 queen mode: one queen per row, column and region.
A 10 by 10 board in 2-star mode under the headline “Two stars per row, column and region”: six stars placed with their dots.
2-star mode: two stars per row, column and region.
The hint ladder at its second step under the headline “Hints that teach the next logical step”: the cells of the deduction highlighted, the technique explained, a Do it button.
Hints count your mistakes first, then walk you to the next step.
Three board cards under the headline “Dark, Classic or colour-blind patterns”: the board in dark appearance, in the black-and-white Classic theme, and in colour-blind mode with a distinct pattern per region.
Light or dark, Classic black-and-white, or colour-blind patterns.
The Solved sheet under the headline “Flawless: no hints, no conflicts”: the Flawless badge, difficulty, time and hints used.
Solve without hints or conflicts for a Flawless badge.
The Home screen under the headline “No ads. No account. Fully offline.”: Continue, the mode, size and difficulty pickers and the New puzzle button.
Pick a mode, a size and a difficulty; nothing leaves your phone.

How it plays

  1. Pick a mode and a size. 1 queen boards go from 6×6 to 11×11; 2 stars boards from 9×9 to 11×11. Choose a difficulty and tap New puzzle.
  2. Tap a cell to cycle it — empty, dot, queen or star. Drag across cells to dot them all; start on one of your dots to erase instead. A placed queen dots its eight neighbours for you.
  3. Reason, never guess. Each row, column and region holds exactly one queen (or two stars), and no two may touch, not even diagonally. Auto-check stripes the ones that do.
  4. Stuck? Hint tells you how many queens and dots are misplaced — never where. Show me where then highlights the row, column or region behind the next logical step, shows the cells, and can apply the step for you.

What makes it Stelline

  • Unlimited boards

    Every puzzle is generated on your iPhone, usually instantly from a small bank kept ready in the background. There is no pack to buy and no daily limit.

  • Exactly one solution

    Each board is checked by an exact solver before you see it. You will never be left with a coin flip between two answers.

  • Honest difficulty

    A deduction engine with 17 human techniques solves every board first and grades it Easy, Medium, Hard or Expert from the reasoning it needed.

  • Hints that teach

    Counts first, locations only if you ask. The step-by-step ladder names the technique and highlights the unit it works on.

  • Made for thinking

    Auto-dots around a placed queen, auto-check for touching pieces, undo and redo, a timer you can hide, and autosave with Continue.

  • Your look

    Queen or star glyphs, dot or X marks, a Classic black-and-white theme, colour-blind mode with distinct region colours, light and dark appearance.

  • Accessible

    Full VoiceOver labels and actions on every cell, Dynamic Type on all controls, Reduce Motion respected.

  • Private by design

    No network access, no account, no analytics, no ads, no third-party code. Nothing you do leaves your phone. Read the privacy policy.

Requirements

Stelline runs on iPhone with iOS 26 or later, in portrait. It is in English. It does not need an internet connection at any point.

Questions or problems? See the support page.