Constellations: Star Logic

Every row, every column and every coloured region of the night sky hides the same number of stars – and stars never touch, not even diagonally. Reason out where they are, and watch them join into a constellation with its own name.

Constellations is a calm, clever star-placing logic puzzle. There is no luck and no guessing: every sky has exactly one solution, and you can always reach it by deduction.

HOW YOU PLAY
• Tap a cell once for a dot (no star here), twice for a star.
• Drag across cells to dot many at once.
• Auto-dots marks the cells a star rules out, so you can focus on the thinking.
• Rule breaks light up at once: touching stars, a crowded row, a region with no room left.
• Undo and redo any move.
• Every sky you solve joins your sky atlas, with its constellation and name.

HINTS THAT TEACH
Stuck? The hint first shows you where to look, then explains the reasoning – and only makes the move if you ask. The first time a new idea comes up, the hint explains it in general, so you learn the trick instead of just getting the answer.

280 SKIES, FOUR DIFFICULTIES
• Easy – small skies and a five-level tutorial that teaches every idea you need
• Medium – bigger skies and your first counting tricks
• Hard – 9×9 skies that need you to look at two rows at once
• Expert – 10×10 skies with two stars in every row, column and region

All 40 Easy levels and the first 10 levels of Medium, Hard and Expert are free. More levels come in one-time packs, or unlock everything at once. No subscriptions, no ads, no account.

MADE FOR THINKERS
• Plays fully offline
• No account, no ads: only anonymous usage stats and crash reports, which you can turn off
• Your progress and best times stay on your device
• A quiet night-sky look with soft chimes

If you enjoy logic puzzles, Sudoku, nonograms or star-and-queen placement puzzles, Constellations is your next favourite.