Last updated: March 2026
These Terms of Service ("Terms") govern your use of Duel Stack ("App," "Service," or "Game"). By downloading and using the App, you agree to these Terms. If you do not agree, do not use the App.
Q8DEV LTD ("Company") grants you a limited, non-exclusive, non-transferable license to use the App for personal, non-commercial purposes. You may not:
Non-Consumable Products: VIP Pass, Remove Ads, and cosmetics are one-time purchases that grant permanent access.
Consumable Products: Coin packs are consumable and do not carry over between purchases.
In-app purchases include both non-consumable items (cosmetic skins, themes, arena backgrounds, emoji packs, Remove Ads, VIP Pass, and Particle Effects) and consumable items (coin packs: 100, 500, and 1500 coins). Non-consumable purchases are permanent and transferable across your devices using the same Apple ID via Restore Purchases. Consumable coin purchases are credited once and are not restorable. All purchases are processed by Apple.
Refunds: All in-app purchases are final. Refunds are governed by Apple's App Store refund policy. Contact Apple directly for refund requests.
Account Deletion: If you delete your Game Center account, you will lose access to all purchased items and gameplay progress.
DuelStack uses an in-game virtual currency called Coins. Coins have no real-world monetary value, cannot be transferred, sold, or exchanged outside the app, and will be forfeited if your account is terminated or the app is discontinued.
Earning Coins: Coins are earned through gameplay in ranked Duel matches only (not Solo or Speed modes). Earn rates are: win a ranked match (+12 coins), lose a ranked match (+3 coins), land a perfect drop in a ranked match (+2 coins), first win of the day (+15 coins bonus), win streak of 3 or more consecutive wins (+10 coins per win), complete a daily challenge (+50 coins), daily login bonus (+25 coins). A free power-up is awarded every 10 duel matches regardless of result. One power-up type is discounted 50% each day on a rotating schedule (Daily Deal).
Purchasing Coins: Coins may also be purchased directly using real money through Apple's App Store. Coin purchases are consumable transactions. All purchases are final. Apple handles all payment processing and refund requests in accordance with their standard policies.
Spending Coins: Coins are spent in the in-game store to acquire power-ups. Power-up costs are: Freeze (30 coins), Shield (50 coins), Speed Boost (40 coins). A maximum of one of each power-up type may be held and used per ranked match.
We reserve the right to adjust coin earn rates, power-up costs, and daily deal rotations at any time.
Power-ups are consumable items that provide gameplay advantages during ranked Duel matches. The Freeze power-up temporarily stops the opponent's moving block for 2 seconds. The Speed Boost power-up doubles the speed of the opponent's moving block for 5 seconds. The Shield power-up allows a player to survive one missed block drop with a reduced penalty instead of losing.
Power-ups may be used in ranked matches and affect Elo ratings. Players who hold power-ups may have a competitive advantage over players who do not. New players receive 3 of each power-up at no cost upon first install. Power-ups are not available in Solo or Speed modes. We believe the skill-based nature of block stacking remains the primary determinant of match outcomes, and power-ups represent a meaningful but limited supplement to player skill.
When you select 'Find Match,' the app searches for a real human opponent via Apple Game Center for up to 15 seconds. If no human opponent is found within this window, the app will automatically match you with an AI bot opponent. Bot matches initiated through 'Find Match' are ranked and affect your Elo rating, identical to matches against human opponents. The bot opponent will be shown with a human-sounding name.
The separate 'Vs AI' mode in the main menu is explicitly unranked, does not affect Elo, and is labeled as AI play throughout.
Multiplayer functionality requires Game Center sign-in. By using Game Center, you agree to:
Violations may result in account suspension or ban.
You agree to play fairly and respectfully. Prohibited behavior includes:
Violations may result in account suspension or permanent ban.
All content in the App, including graphics, gameplay, music, and code, is owned by Q8DEV LTD or its licensors. You may not use, copy, or distribute this content without permission.
User-Generated Content: Any cosmetics, skins, or themes you create remain your property, but you grant Q8DEV LTD a license to use them in the App.
TO THE MAXIMUM EXTENT PERMITTED BY LAW, Q8DEV LTD IS NOT LIABLE FOR:
Our total liability shall not exceed the amount you paid for in-app purchases in the past 12 months.
THE APP IS PROVIDED "AS IS" WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED. Q8DEV LTD DOES NOT WARRANT THAT THE APP WILL BE ERROR-FREE, UNINTERRUPTED, OR SECURE.
We may terminate your access to the App if you violate these Terms. Upon termination:
These Terms are governed by the laws of Kuwait, without regard to conflict of law principles. Any disputes shall be resolved in the courts of Kuwait. Notwithstanding the foregoing, if you are located in the European Economic Area, the laws of your country of residence may provide you with additional mandatory consumer protections that apply regardless of the chosen governing law.
DuelStack is rated 4+ and suitable for all ages. In-app purchases require Apple ID authentication. Parents and guardians are responsible for managing purchase permissions through iOS Screen Time settings. By allowing a minor to use this app, the parent or guardian agrees to these Terms on the minor's behalf.
By using Duel Stack on iOS, you also agree to Apple's Standard EULA. In the event of conflict, Apple's terms take precedence.
We may update these Terms at any time. Continued use of the App constitutes acceptance of updated Terms. We will notify you of material changes via the App or email.
For questions about these Terms, please contact us at:
Email: q8y.c0d@gmail.com
© 2026 Q8DEV LTD. All rights reserved.
Last updated: March 2026