Fact sheet
- Developer
- Tobias Kummer, independent, Geislingen, Germany
- Release
- 31 October 2026
- Platform
- Android, phones and tablets (Google Play)
- Price
- Free to start. “The full sky”, a one-time purchase: US$4.99 / €4.99 (prices vary by country)
- Genre
- Logic puzzle, single player
- Language
- English
- Engine
- Godot
- Content
- 121 hand-made puzzles in seven worlds and the Zodiac, a puzzle every night, over 2,000 generated Deep Sky puzzles
- Ads, tracking
- None. Plays offline.
- Press contact
- tobiaskummer@googlemail.com
Description
Asterism is a calm logic puzzle on a hex grid. Each number counts the stars touching its hex, as in Minesweeper, but every puzzle is checked so that it can be solved by reasoning alone: there is never a 50/50 guess. When you place the last star, the stars you found join into a constellation, and the constellation takes its place on an engraved sky atlas.
Seven hand-made worlds each add a new rule: line clues along the board’s edge, arcs that tell whether a number’s stars touch, stars that show their own count, mirrored skies, stars in pairs and glowing nebula regions. A Zodiac of twelve signs then combines them two at a time.
There is a new puzzle every night, gentle on Mondays and hardest on Sundays, and Deep Sky holds over 2,000 generated puzzles, chosen by rule and depth. Hints don’t just reveal a hex: they ring the numbers that matter, mark the hex they decide and explain the reasoning in plain words.
Features
- Never guess: every puzzle, hand-made or generated, is solvable from the numbers alone
- Every solve draws its own constellation; the atlas fills as you play
- Seven worlds, seven rules, and a Zodiac that combines them
- A puzzle every night, with a month of moons that lights up as you solve
- Over 2,000 Deep Sky puzzles by rule and depth
- Hints that explain why, step by step
- Every move rated proven or lucky; three seals for a puzzle solved by proof alone
- Swipe up for a star, down for dark sky, or tap and use the buttons
- No ads, no time limits, no lives, no streaks; plays offline
How the puzzles are made
Every puzzle in Asterism, the hand-made worlds and the 2,000 generated ones alike, goes through a solver that may only use deductions a player can make from the numbers on the board. A puzzle ships only if that solver can finish it without a single guess. The hints are built from the same kind of deduction, so a hint always explains a step you could have found yourself.
What players say
“If you used to play Minesweeper, you’re going to love this.”
“The constellation payoff at the end is a nice touch, way more satisfying than just clearing a board.”
“Super unterhaltsam, Suchtgefahr!” (Great fun, dangerously addictive!)
