Effective date: October 13, 2026
These Terms of Use ("Terms") govern your use of the DUOL mobile game ("DUOL", "the App"), developed by Aykhan Valiyev (Valiyev Games). By downloading or using the App you agree to these Terms and to our Privacy Policy. If you do not agree, do not use the App.
If you downloaded the App from Apple's App Store, Apple's Licensed Application End User License Agreement also applies; where these Terms and Apple's agreement conflict, Apple's agreement governs your license to the App.
DUOL is a puzzle game: one swipe moves two orbs at once, and each must reach the ring of its own colour. The game is free to play, with optional in-app purchases. On Android it also shows ads: short rewarded videos that you choose to watch (for example for a hint, a freezer, extra moves or free gems) and, from time to time, a full-screen ad between levels.
Gems. Gems are an in-game currency used for hints, freezers and rescues. Gem packs are one-time purchases processed by Apple or Google. Gems have no real-world value, cannot be exchanged for money and are non-refundable except where required by law or by the store's refund policy.
Premium pass (Android). The Premium pass is a monthly subscription sold through Google Play. It removes the ads shown between levels (rewarded videos stay available when you choose to watch one) and gives a one-time welcome bonus of 50 gems and 1 freezer when you join. The price is shown in Google Play before you buy. The subscription renews automatically each month until you cancel it in Google Play (Play Store > Payments & subscriptions > Subscriptions); after you cancel, the pass stays active until the end of the period you paid for. Refunds follow Google Play's refund policy.
Gems, hints and freezers are licensed to you for use in the App, not sold. They are stored on your device and are lost if you delete the App. We may adjust the in-game economy to keep the game fair and fun.
You agree not to modify, reverse-engineer or decompile the App, use cheats or automation, or try to access parts of the App or its services without permission.
The App and its content (graphics, sounds, levels, text and code) belong to the developer and are protected by law. You may not copy, distribute or create derivative works without written permission.
The App is provided "as is" and "as available" without warranties of any kind, to the extent permitted by law.
To the maximum extent permitted by law, the developer is not liable for indirect, incidental or consequential damages arising from your use of the App, including loss of data or virtual items.
We may update these Terms. Changes take effect when posted here with a new effective date; continuing to use the App means you accept them.