Logic remains legible
Numbers, notes, row–column–box feedback, and recovery controls stay clear before any atmosphere arrives.
A logic universe by Astra Games
One enduring rule.
One enduring rule.
A thousand ways to enter it.
Sudoku Cosmos begins with the familiar 9×9 grid, then builds outward: visual worlds that change the feeling—not the logic—an authored Cipher archive, and an Android game designed to keep core play local.
Classic logic✦Five worlds◈Local progress✦Cipher cases
The product thesis
The board is not a backdrop. It is the place.
The first rule of the project is restraint: every world, sound, story beat, and reward system must preserve the clarity of the next logical move.
Worlds add feeling
Each world has its own visual voice. The standard Sudoku contract does not change with the scenery.
Progress belongs to the player
Core Android play keeps its state on-device; the Recovery Vault provides a player-controlled device-change path.
Astra, the guide signal
A character should frame the journey, not crowd the thought.
Astra gives Sudoku Cosmos a human temperature. She is the guide at the edge of each world: observant enough to make a place feel inhabited, quiet enough to leave the player and the grid alone when concentration matters.
This is the difference between a mascot and a design role. Astra carries continuity between a nebula, a garden, a reef, and a classified cabinet without turning the board into a stage prop.
Meet Astra’s design role →The World Atlas
Five moods. One unbroken Sudoku language.
Switch the atmosphere, not the core rule set. The Android game lets the same logic speak through different visual systems.
01✦
Nariman Number Nebula
Cosmic star lanes and constellation routes. The original home world.
02◈
Neon Circuit
A live arcade district where each clean solve relights the skyline.
03◇
Stone Age Sigils
Ceremonial locks, relic murals, and a gentle excavation rhythm.
04◉
Ocean Pulse
Luminous reef currents that turn row and column flow into a dive.
05✦
Zen Bloom
A quiet garden of petals, control, and ceremonial finishes.
Cipher Code
A second route appears when the grid becomes evidence.
Five fictional detective-puzzle episodes turn completed boards into recovered archive keys. The standard worlds remain the foundation; Cipher is an optional, noir-toned investigation track for players who want another layer of meaning around the same act of deduction.
Play free Sudoku online
Choose the world.
Choose the world.
Read the grid.
This is a free, no-account browser sample of classic 9×9 Sudoku. It starts with one fixed learning grid and four clue profiles; it is not an unlimited web-puzzle library or the full Android game.
Free browser boardClassic 9×9 · no accountFixed browser sample · four clue profiles
Astraonline
WorldNariman Number NebulaCONSTELLATION SIGNAL
Time00:00session
02 / Clue profile
WORLD KEY
1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9
Number lanes / keyboard still accepts 1–9
Nebula board / easy orbitclassic rules
Rule focus Row · Column · 3×3 boxNumber lanes world signs / values 1–9Easy Orbit browser clue profile
Sketch to app
A familiar grid became a platform for attention.
The public site records the thinking behind the game: every layer exists to support a more dependable puzzle ritual.
- 01Preserve the classic contract
Start with a readable board, clear number input, notes, feedback, and a fair path to recovery.
- 02Build the worlds around it
Turn visual design into travel: constellation maps, neon circuits, sigils, currents, petals.
- 03Make difficulty a journey
Progress from Easy through Killer as a continuous 9×9 ladder, then enter 16×16 Beyond.
- 04Open a story route
Place Cipher beside—not over—the main game, using cases and evidence to reward curiosity.
- 05Protect continuity
Make local progress, encrypted device transfer, and player-controlled exports part of the product contract.
Android edition
See store status →The full library is designed for the moments between connections.
The Android game contains 1,000 Sudoku boards across five tiers, five worlds, local progress, and Cipher’s five fictional episodes. The public store listing is being prepared; the Android and iOS path is kept visible from every page without pretending that an unavailable store link is live.