In development
Decussis
Cross sums with pure logic. Unique solutions, never guess. Clean Kakuro.
- Flutter
- Material 3
- Offline
- 13 languages
Not on Google Play yet.
Decussis is a Kakuro puzzle — also known as Cross Sums (加算クロス) — crafted for players who love pure, mathematical deduction.
Fill the white cells with digits from 1 to 9 so that every horizontal and vertical run adds up to the clue number at its start. Within each run, no digit may appear more than once.
No guessing, ever
Every puzzle has exactly one solution, and every step can be deduced with logic alone. Each board is verified by a human-style solver that only uses explainable deductive techniques. You will never have to guess or use trial and error.
A weekly rhythm
Gentle on Monday, deeply challenging on Sunday. Build your streak day after day, and protect it with a streak freeze when life interrupts.
Built to be pleasant
Refined Material 3 aesthetics with full light and dark mode support. Plays 100% offline with optional Google Play Games cloud save and achievements.
Free and fair
Decussis is free to play and supported by respectful ads. Remove ads permanently with a single one-time purchase.
Data safety
What Decussis does with data
| Data | Handling | Purpose | Linked to you |
|---|---|---|---|
| Device or other IDs (Advertising ID) | Collected, shared with Google AdMob | Advertising | Not linked to your identity |
| Approximate location (from IP) | Collected by AdMob | Advertising | Not linked to your identity |
| Play Games player ID, profile name | Collected only if you sign in | Leaderboards, achievements, cloud save | Linked to your Google account |
| Purchase history | Handled by Google Play Billing | Entitlement: unlocking what you bought | Linked to your Google account |
| Game progress and settings | Stored on your device only | App functionality | Not collected by us |
Package: dev.sequencode.decussis