Privacy Policy

Effective date: 21 October 2026 · Applies to the Marble Drift Android app (package com.marbledrift).

In short

Guest mode keeps everything on your phone and sends nothing anywhere. The full game signs you in with your Solana wallet address and stores your game progress on our server. There are no ads, no analytics and no tracking in the app. We never see your wallet's private keys or seed phrase.

1. Guest mode

Guest progress (levels, stars, best times, hearts and settings) is stored only in the app's private storage on your phone. It is not sent to any server and is deleted when you uninstall the app. Guest progress is not transferred to the full game.

2. The full game: what we store

When you connect a wallet, the app asks your wallet to sign a short “Sign in with Solana” message. This creates your account. We store, on our server (a Supabase database):

• Your wallet address (public), as your account identifier.
• Your game progress: level results (stars and best times), hearts and their timer, streak, streak freezes, your best Daily Maze time of the day, the marbles you own, your chosen marble and your game settings.
• Your purchases: the item, the coin used, the amount, the wallet that paid and the blockchain transaction signature.

We use this only to run the game: to give you your progress and items on any device you sign in with, to keep time-based features (hearts, the Daily Maze, streaks) on the server's clock, and to check that payments are genuine.

3. The blockchain is public

Payments are Solana transactions. They are public and permanent: anyone can see your wallet address, the amount, and the note we attach so the payment can be matched to your order. We cannot change or delete blockchain data.

4. Your wallet

You connect and approve payments in your own wallet app (for example the Seed Vault on a Solana phone, Phantom or Solflare). Marble Drift never receives your private keys or seed phrase. Your wallet app is provided by its own developer and has its own privacy policy.

5. Other services the game uses

• Supabase hosts the sign-in, the database and the server functions.
• Solana network nodes (RPC) are used to send and read transactions.
• Public price services are queried by our server to convert dollar prices into SOL or SKR. No player information is sent to them.

These services receive the technical information needed to answer a request (such as your IP address) and handle it under their own policies.

6. What we do not do

The app has no advertising, no analytics, no crash-reporting service and no tracking. We do not sell or share your data for marketing. We do not ask for your name, email, phone number, location, contacts or photos.

7. Permissions

• Internet: for the full game (sign-in, saving progress, prices, payments). Guest mode does not need it.
• Vibration: for the game's haptic feedback.

8. Children

The app does not knowingly collect personal information from children. Purchases are made with cryptocurrency from a wallet the player controls; children should only use the full game with an adult's permission.

9. Your rights and deletion

You can ask us to show or delete the data stored under your wallet address by writing to the address below from your contact details and stating your wallet address. We will delete your progress data and account. Blockchain transactions cannot be deleted. Uninstalling the app removes the guest data on your phone.

10. Changes to this policy

If the app starts handling data in a new way, this page will be updated before that version is released and the effective date will change.

11. Contact

Questions about this policy: sfeir.skr@gmail.com