Kropki 3D Sudoku

About the app

Kropki 3D Sudoku is a mobile puzzle game. The board is a cube: each face must hold digits 1–9 with no repeats on that face. Edges of the cube can show Kropki markers linking neighboring cells, giving you the same logic as on a flat grid with those clues — extended into three dimensions.

How to play

• Face rule: On each face of the cube, every digit from 1 to 9 appears exactly once.
• White clue: Two adjacent values (along a marked edge) are consecutive (difference 1).
• Black clue: One value is double the other (ratio 2∶1).
• Goal: Fill all the blanks so all constraints are satisfied !

Game modes

Privacy policy

This policy describes how Kropki 3D Sudoku (the app) and its optional online services treat information. It applies to the mobile app and to data processed on our game API host kropki.orbita.re.

Summary

The core puzzle runs on your device. You can play offline for much of the experience. If you choose online nickname registration, leaderboards, or community puzzle sharing, we process the limited game-related data described below. We do not share your nickname or scores outside of the app. We do not sell your personal information or use it for any other purpose.

What we collect on your device

• Game progress and settings — Puzzle state, campaign and Genius progress, daily streaks, timers, notes, and preferences are stored locally (for example via the app’s local database and secure storage). This stays on your phone unless you use a feature that explicitly sends data to our servers.
• In-progress games — Unsolved boards and timers may be saved locally so you can resume later.

Optional online services (game API)

When you register a public nickname for online features, the app creates a cryptographic credential on the server and stores a matching signing secret on your device. That secret is used to authenticate leaderboard and account actions; we do not use it to track you across unrelated apps or websites.

• Leaderboards — For each puzzle code you submit a time for, we may store your nickname, the puzzle identifier, your best time in seconds, and when it was last updated. Other players can see nickname and times on leaderboards for the same puzzle.
• Account management — You can rename your nickname or delete your online account from the app. Deleting removes your server-side player record and associated leaderboard rows for our service as implemented at that time.
• Community gems — If you submit a puzzle to the community list, we store the puzzle code, your nickname as submitter, and a timestamp. If you vote on community puzzles, we store your nickname, the vote, and timing data needed to run the feature.

We use this information only to operate rankings and community features.

Camera

The app may request camera access so you can scan QR codes to import puzzle layouts or account transfer codes. Scanning is handled on your device; we do not receive a video feed from your camera for that flow. Some store builds may list other permissions required by the platform or bundled libraries; those are not used by the app to collect extra categories of data beyond what this policy states for our own features.

Sharing and processors

• Hosting — Online API traffic is handled by our infrastructure providers as part of normal web hosting (TLS, logs, and storage for the database described above).

Your choices and regional rights

You can stop using online features at any time, by deleting your online account from the app’s settings.