Effective Date: August 9, 2026

These Terms of Use (the “Terms”) are a legal agreement between Doorbell Studios (“Doorbell Studios,” “we,” “us,” or “our”) and each person who downloads, installs, accesses, or uses Ultimate Big Two on iOS, iPadOS, Android, or any other supported platform, together with related features, websites, online rooms, ranked play, advertising-supported services, support channels, invite links, and other services we provide (collectively, the “App”).

By downloading, installing, accessing, creating an account for, or using the App, you agree to these Terms. If you do not agree, do not use the App.

These Terms are designed for operation in the United States and Canada and are intended to work with applicable consumer protection, advertising, privacy, mobile platform, and electronic contracting laws. Some rights cannot be waived under applicable law. If a required legal protection applies to you, these Terms apply only to the fullest extent permitted by that law.

1. Who We Are and How to Contact Us

Doorbell Studios owns and operates the App.

Doorbell Studios

Email: contactfitarc@gmail.com

Legal notices, support requests, account questions, intellectual-property notices, and consumer complaints may be sent to this email unless we publish another required contact method.

2. The App

Ultimate Big Two is a digital card game inspired by Big Two / Tien Len Mien Nam-style play. The App may include local gameplay, bot opponents, online rooms, invite links, ranked profiles, leaderboards, season titles, match history, advertising, account sign-in, and related features.

The App is provided for entertainment. It is not gambling, a casino product, a betting service, financial advice, professional advice, or a way to earn money. Unless Doorbell Studios expressly states otherwise in separate written contest rules, the App does not offer real-money wagering, cash prizes, cash-equivalent prizes, or redeemable financial rewards.

3. Eligibility

You may use the App only if you can legally agree to these Terms and are not prohibited from using the App under applicable law.

The App is not directed to children under 13. If you are under the age of majority where you live, you may use the App only with permission and supervision from a parent or legal guardian. The parent or guardian is responsible for the minor’s use of the App.

We may refuse, suspend, or terminate access if we believe you are ineligible, are using the App unlawfully, or are creating legal, safety, security, or operational risk.

4. Accounts and Sign-In

Online and ranked features may require authentication through Firebase, Sign in with Apple, Google Sign-In, or another provider we support. You are responsible for maintaining the security of your device, Apple account, Google account, Google Play account, app store account, credentials, and sign-in methods.

You agree to provide accurate information and not impersonate anyone else. You are responsible for activity under your account, except to the extent caused by Doorbell Studios’ proven breach of these Terms or applicable law.

We may suspend or terminate accounts or access to online features if we believe an account is compromised, abusive, fraudulent, inactive, unauthorized, technically harmful, or otherwise in violation of these Terms.

4.1 Account Deletion

You may request deletion of your signed-in account from within the App by openin Game Settings and choosing Delete Account. Before deletion is completed, the App may require a fresh Apple or Google sign-in to confirm that the request is coming from the account holder. If you use Sign in with Apple, the App may also revoke the Apple authorization token connected to the App.

When account deletion is completed, your Firebase Auth account is deleted, your account-linked ranked profile is removed, your active online lobby and live-match presence is cleared or anonymized where technically feasible, and local match history and scoreboard data on that device are reset. Deletion is intended to be permanent. If you sign in again later, the App may create a new account or profile without restoring previous ranked data, room access, match history, or local stats.

Account deletion does not require Doorbell Studios to delete information we are legally permitted or required to retain, including de-identified or aggregated data, security and fraud-prevention records, diagnostic logs, dispute records, legal compliance records, app store records, third-party provider records, or information needed to protect other users and service integrity. The Privacy Policy explains account deletion and data retention in more detail.

5. License to Use the App

Subject to your compliance with these Terms, Doorbell Studios grants you a limited, personal, revocable, non-exclusive, non-transferable, non-sublicensable license to download, install, access, and use the App for personal, non-commercial entertainment on supported Apple-branded devices, Android devices, or other supported devices that you own or control, as permitted by applicable app store, platform, Apple, and Google Play terms.

This license does not transfer ownership of the App or any content, code, design, technology, rules implementation, artwork, trademarks, data, or other intellectual property.

Doorbell Studios reserves all rights not expressly granted in these Terms.

6. Platform Store Terms

The App may be distributed through the Apple App Store, Google Play Store, or another authorized app marketplace. Your download, installation, purchase, refund, update, and use of the App may also be governed by the terms, policies, billing rules, refund rules, and developer or user agreements of the platform where you obtained the App.

6.1 Apple App Store

If you download the App from Apple’s App Store, the following additional terms apply:

– These Terms are between you and Doorbell Studios, not Apple.

– Apple is not responsible for the App or its content.

– Apple has no obligation to provide maintenance or support for the App.

– Apple may have responsibilities for refunds or purchase issues only as required by Apple policy or applicable law.

– Apple and Apple’s subsidiaries are third-party beneficiaries of these Terms and may enforce these Terms against you.

– Your use of the App must comply with the Apple Media Services Terms and Conditions, App Store rules, and applicable Apple policies.

6.2 Google Play Store and Android

If you download the App from Google Play or use the App on Android, the following additional terms apply:

– These Terms are between you and Doorbell Studios, not Google.

– Google is not responsible for the App, its content, maintenance, support, user disputes, or Doorbell Studios’ legal compliance except as required by Google Play terms, Google policy, or applicable law.

– Your use of the App must comply with the Google Play Terms of Service, Google Play policies, Android platform rules, Google Play billing rules where applicable, and any terms that apply to your Google account or Android device.

– Google Play may process installs, updates, purchases, refunds, reviews, ratings, safety information, device integrity checks, and other platform functions under Google’s own terms and privacy policies.- Google Play Data safety disclosures and similar store disclosures are summaries for platform transparency. The full Doorbell Studios privacy notice remains the Privacy Policy.

If these Terms conflict with mandatory Apple App Store, Google Play Store, Android, or other app marketplace terms, the mandatory platform terms control only to the extent required.

7. Privacy

Our collection and use of information is described in our Privacy Policy. The Privacy Policy is incorporated into these Terms by reference.

By using the App, you acknowledge that the App may process account information, gameplay data, local match history, online room information, ranked profiles, advertising identifiers where permitted, device information, diagnostic data, and support communications as described in the Privacy Policy.

8. Online Rooms, Invite Links, and Ranked Play

Online rooms, room codes, invite links, ranked profiles, leaderboards, season titles, match results, and related features are provided at Doorbell Studios’ discretion.

You understand and agree that:

– Room codes and invite links may allow others to attempt to join a room.

– Display names, room presence, game activity, ranked scores, leaderboard placement, season titles, and match results may be visible to other users.

– Online play depends on networks, service providers, device performance, Firebase, app versions, and other systems outside Doorbell Studios’ full control.

– Disconnections, latency, app crashes, bugs, rule updates, fraud-prevention decisions, bot behavior, and backend transactions may affect gameplay or rankings.

– Doorbell Studios may correct, reset, remove, hide, modify, or refuse to record match results, ranked points, season titles, or leaderboard entries when we believe it is necessary to protect game integrity, fix errors, respond to abuse, comply with law, or operate the App.

Doorbell Studios does not guarantee any ranking, matchmaking result, card distribution, win rate, bot decision, season outcome, or continued availability of any online feature.

9. Game Rules, Bots, and Fair Play

The App uses software-based game rules, automated state synchronization, and bot logic. These systems may change over time.

You agree not to cheat, exploit, manipulate, reverse engineer, automate, disrupt, or abuse the App. Prohibited conduct includes:

– Using bots, scripts, automation, modified clients, packet manipulation, or unauthorized tools.

– Exploiting bugs, timing issues, desynchronization, or backend behavior.

– Interfering with another user’s game, account, room, device, or network.

– Creating false accounts, fake identities, or coordinated behavior to manipulate rankings.

– Attempting to bypass authentication, Firestore rules, App Check, access controls, ads, timers, bans, or security measures.

– Harassing, threatening, defaming, impersonating, or abusing other users.

– Using offensive, unlawful, misleading, or privacy-invasive player names, room titles, or other visible text.

We may investigate suspected violations and may remove results, restrict access, suspend accounts, ban devices or identifiers, preserve records, or report conduct to service providers or authorities where appropriate.

10. User Content and Communications

The App may allow you to provide player names, room titles, support messages, screenshots, feedback, or other content (“User Content”). You retain ownership of User Content you submit, subject to the license below.

You grant Doorbell Studios a worldwide, royalty-free, transferable, sub-licensable, non-exclusive license to host, store, use, reproduce, modify, display, disclose, transmit, and otherwise process User Content for purposes of operating, improving, securing, promoting, and supporting the App, enforcing these Terms, and complying with law.

You represent that you have all rights needed to submit your User Content and that it does not violate law, third-party rights, or these Terms.

Doorbell Studios may remove, edit, restrict, or refuse User Content at any time, with or without notice, where we believe it violates these Terms, creates risk, affects user experience, or may expose Doorbell Studios or others to liability.

11. Advertising

The App may show ads, including banners and interstitial ads. Ads may be provided by Google AdMob or other advertising partners.

You agree that:

– Ads may appear during or around gameplay, including at natural gameplay pauses.

– Ad availability, format, frequency, personalization, and measurement may change.

– Advertising partners may apply their own terms, policies, and privacy practices.

– Doorbell Studios is not responsible for third-party ad content, landing pages, products, services, or claims.

You must not manipulate, automate, fraudulently interact with, or interfere with ads or ad measurement.

12. Purchases, Subscriptions, and Paid Features

The current App may be advertising-supported and may not offer paid features. If Doorbell Studios later offers in-app purchases, subscriptions, paid features, ad removal, digital items, battle passes, tournament entries, or similar paid products, additional purchase terms may apply.

Unless separate purchase terms state otherwise:

– Digital items and paid features are licensed, not sold.

– Digital items have no cash value and cannot be sold, transferred, redeemed for money, or exchanged outside the App.

– Purchases are processed by the applicable app store or payment provider, including Apple App Store, Google Play billing, or another authorized billing provider where available.

– Refunds, cancellations, taxes, billing issues, and payment disputes may be handled by Apple, Google Play, the app store, or payment provider according to its policies and applicable law.

– Prices, renewal terms, cancellation methods, trial terms, and mandatory charges will be disclosed where required before purchase.

Doorbell Studios will not intentionally use drip pricing or hidden mandatory fees. If subscriptions or automatic renewals are introduced, Doorbell Studios intends to provide clear pricing, renewal, cancellation, and consent disclosures required by applicable U.S. and Canadian law, including state automatic-renewal laws and Canadian deceptive-marketing rules.

13. No Real-Money Gambling or Prizes

The App is for entertainment gameplay. You may not use the App for illegal gambling, betting, wagering, staking, bookmaking, paid contests, money games, sweepstakes, lotteries, or prize competitions unless Doorbell Studios expressly authorizes a feature in separate written rules that comply with applicable law.

You are solely responsible for complying with laws where you live and where you use the App.

14. Intellectual Property

Doorbell Studios and its licensors own the App, including software, source code, object code, game logic implementation, designs, visual elements, text, artwork, interfaces, animations, names, logos, trademarks, service marks, trade dress, documentation, and all related intellectual-property rights.

You may not copy, modify, adapt, translate, distribute, sell, rent, lease, sublicense, publicly perform, publicly display, create derivative works from, scrape, extract, train models on, or commercially exploit the App except as expressly permitted by these Terms or applicable law.

You may not remove copyright, trademark, attribution, proprietary-rights, or legal notices from the App.

15. Feedback

If you send ideas, suggestions, bug reports, feature requests, designs, gameplay concepts, or other feedback, you grant Doorbell Studios a perpetual, irrevocable, worldwide, royalty-free, fully paid, transferable, sub-licensable license to use, modify, commercialize, and exploit that feedback for any purpose without compensation, attribution, or obligation to you.

Do not send feedback you consider confidential or proprietary.

16. Third-Party Services

The App may depend on or link to third-party services, including Apple, Apple App Store, Google, Google Play Store, Android, Google Play services, Firebase, Google Sign-In, Sign in with Apple, Google AdMob, app stores, cloud services, device platforms, and support providers.

Doorbell Studios does not control third-party services and is not responsible for their content, policies, performance, downtime, security, actions, omissions, or availability. Your use of third-party services may be governed by separate terms and privacy policies.

17. Updates, Changes, and Availability

Doorbell Studios may update, modify, suspend, discontinue, replace, limit, or remove any part of the App at any time, including rules, bots, rankings, rooms, season systems, ads, difficulty settings, local features, online services, backend providers, or supported devices.

We may provide updates automatically or through app stores, including the Apple App Store and Google Play Store where applicable. You may need to install updates to continue using the App or online features.

We do not guarantee that the App will be available, error-free, secure, compatible with every device, or maintained indefinitely.

18. Termination

You may stop using the App at any time and may delete the App from your device.

You may also delete your signed-in account through the in-app deletion control described in Section 4.1. Deleting the App from your device is not the same as deleting your account and may not remove account-linked records from Firebase, ranked services, app store systems, or third-party provider systems.

Doorbell Studios may suspend, restrict, or terminate your access to the App or any feature at any time, with or without notice, where we believe you violated these Terms, created risk, misused the App, infringed rights, caused harm, broke the law, interfered with operations, or where continued service is no longer commercially, legally, or technically practical.

After termination, sections intended to survive will continue to apply, including intellectual-property rights, disclaimers, limitations of liability, indemnity, dispute terms, and any payment obligations that survive under applicable law.

19. Disclaimers

To the fullest extent permitted by law, the App is provided “as is,” “as available,” and “with all faults.” Doorbell Studios disclaims all warranties, representations, and conditions, whether express, implied, statutory, or otherwise, including implied warranties of merchantability, fitness for a particular purpose, title, quiet enjoyment, accuracy, availability, non-infringement, and uninterrupted or error-free operation.

Doorbell Studios does not warrant that:

– The App will meet your expectations.

– Gameplay, rankings, bots, ads, rooms, or online services will be uninterrupted or error-free.

– Bugs, crashes, data loss, desynchronization, security issues, or incorrect results will never occur.

– The App will remain compatible with all devices, operating systems, networks, or third-party services.

– Any content, ad, link, provider, leaderboard, or match result is accurate, complete, reliable, or available.

Some jurisdictions do not allow certain disclaimers. In those jurisdictions, the disclaimers apply only to the fullest extent permitted by law.

20. Limitation of Liability

To the fullest extent permitted by law, Doorbell Studios and its owners, officers, directors, employees, contractors, agents, licensors, service providers, and affiliates will not be liable for indirect, incidental, consequential, special, exemplary, punitive, enhanced, or similar damages, including lost profits, lost data, loss of goodwill, business interruption, device failure, account loss, ranking loss, match-result loss, or cost of substitute services.

To the fullest extent permitted by law, Doorbell Studios’ total liability for all claims arising out of or relating to the App or these Terms will not exceed the greater of:

– The amount you paid directly to Doorbell Studios for the App in the six months before the claim; or

– USD $50.00.

These limits apply regardless of the theory of liability, even if a remedy fails of its essential purpose and even if Doorbell Studios was advised of the possibility of damages.

Nothing in these Terms limits liability that cannot be limited under applicable law, such as liability for intentional misconduct, gross negligence where it cannot be limited, certain consumer protection rights, or other non-waivable rights.

21. Indemnity

To the fullest extent permitted by law, you agree to defend, indemnify, and hold harmless Doorbell Studios and its owners, officers, directors, employees, contractors, agents, licensors, service providers, and affiliates from and against claims, demands, losses, liabilities, damages, judgments, penalties, fines, costs, and expenses, including reasonable attorneys’ fees, arising from or related to:

– Your use or misuse of the App.

– Your violation of these Terms.

– Your violation of law or third-party rights.

– Your User Content or feedback.

– Your cheating, abusive behavior, fraud, security interference, or unauthorized access.

– Your use of room codes, invite links, online rooms, rankings, ads, or third-party services.

Doorbell Studios may control the defense of any matter subject to indemnification. You agree to cooperate with our defense and settlement of those claims.

22. Consumer Protection Rights

These Terms do not exclude, restrict, or modify consumer guarantees, statutory warranties, refund rights, cancellation rights, unfair-contract protections, accessibility rights, language rights, or other rights that cannot be excluded, restricted, or modified under applicable U.S. federal law, U.S. state law, Canadian federal law, Canadian provincial law, or other applicable law.

For Canadian consumers, this includes rights that may apply under provincial consumer protection laws, Quebec’s Consumer Protection Act, and rules against false or misleading representations and drip pricing under the Competition Act.

If a provision of these Terms conflicts with a non-waivable consumer right, the non-waivable right controls only to the extent of the conflict.

23. Dispute Resolution

Please contact us first at contactfitarc@gmail.com so we can try to resolve the issue informally.To the fullest extent permitted by law, any dispute, claim, or controversy arising out of or relating to the App or these Terms will be resolved individually and not as part of a class, collective, consolidated, representative, or private-attorney-general action.

For users in the United States, Doorbell Studios may elect to require binding individual arbitration for disputes where arbitration and class-action waivers are enforceable under applicable law. If Doorbell Studios makes that election, arbitration will be administered by a reputable arbitration provider under consumer arbitration rules that are legally valid for the claim and forum involved. Doorbell Studios will not require arbitration of claims that cannot legally be arbitrated.

For users in Canada, arbitration, forum-selection, jury-waiver, class-waiver, and limitation provisions apply only to the extent enforceable under applicable federal and provincial law. Some provinces, including Quebec and Ontario in some consumer contexts, may restrict mandatory arbitration, forum selection, or class-action waivers.

Either party may bring an individual claim in small claims court where permitted. Either party may seek injunctive or equitable relief in court for intellectual-property misuse, unauthorized access, security abuse, or misuse of the App.

24. Governing Law and Forum

To the fullest extent permitted by law, these Terms are governed by the laws of the jurisdiction where Doorbell Studios is legally organized or principally operates, without regard to conflict-of-law rules.

Where Doorbell Studios has not published that jurisdiction, and where no non-waivable consumer law requires another forum, Doorbell Studios may designate a reasonable court or arbitral forum for disputes arising from the App.

If you are a consumer in the United States or Canada, you may have mandatory rights under the laws of your state, province, territory, or country of residence. Nothing in these Terms deprives you of protections that cannot be waived by contract.

25. Export, Sanctions, and Legal Compliance

You may use the App only in compliance with applicable laws, including U.S. and Canadian export-control, sanctions, anti-corruption, consumer protection, privacy, intellectual-property, telecommunications, and platform rules.

You may not use the App if you are located in, ordinarily resident in, organized under the laws of, or acting on behalf of a country, region, person, or entity subject to sanctions or restrictions that prohibit use of the App.

26. Notices and Electronic Communications

You agree that Doorbell Studios may provide notices electronically, including through the App, Apple App Store listings, Google Play Store listings, release notes, email, links, support responses, or website postings. Electronic notices satisfy legal notice requirements to the fullest extent permitted by law.

You are responsible for keeping your contact information, Apple account information, Google Play account information, and app store account information current.

27. Changes to These Terms

Doorbell Studios may update these Terms from time to time. The updated version will be indicated by a new effective date or last updated date.

If changes are material, we may provide additional notice where required, such as in-app notice, app store release notes, email, or another reasonable method. Your continued use of the App after updated Terms become effective means you accept the updated Terms, to the extent permitted by law.

If you do not agree to updated Terms, you must stop using the App.

28. Severability; No Waiver; Assignment

If any provision of these Terms is found unenforceable, that provision will be modified to the minimum extent necessary to make it enforceable, or severed if modification is not permitted. The remaining provisions will remain in effect.

Doorbell Studios’ failure to enforce a provision is not a waiver of its right to enforce that provision later.

You may not assign or transfer these Terms or your App rights without Doorbell Studios’ prior written consent. Doorbell Studios may assign or transfer these Terms in connection with a merger, acquisition, financing, reorganization, sale of assets, transfer of business, operation of law, or similar transaction.

29. Entire Agreement

These Terms, together with the Privacy Policy and any additional terms presented for specific features, are the entire agreement between you and Doorbell Studios regarding the App and replace prior or contemporaneous understandings about the App.

If additional feature-specific terms conflict with these Terms, the feature-specific terms control only for that feature and only to the extent of the conflict.

30. Contact

For questions about these Terms, contact: