Math Game 隱私權政策

最後更新日期：2026 年 10 月 1 日

本隱私權政策說明 Math Game（Android / iOS 應用程式；Android 套件名稱 com.mrjc.mathgame、iOS Bundle ID com.mrjc0509.countcard，以下簡稱「本應用程式」）如何蒐集、使用與保護你的資料。本應用程式由 MRJC（以下簡稱「我們」）開發與營運。安裝或使用本應用程式即表示你同意本政策所述的作法。

重點摘要：本應用程式不需要註冊帳號、不需要登入，也不會要求你的姓名或電子郵件。第一次開啟時，我們會自動產生一組隨機的「裝置身分」，用來把你的成績放上世界排行榜，並在你重新安裝後仍認得你。

1. 我們蒐集的資料

使用本應用程式時，我們會蒐集下列資料：

資料類型	用途	來源
裝置身分（隨機產生的匿名識別碼）	把你的成績與排行榜紀錄關聯在一起；重新安裝或換機後仍能認得你	首次開啟時自動產生，儲存在你裝置的安全儲存區（iOS 為系統鑰匙圈 Keychain，Android 為應用程式私有儲存空間）
暱稱	在排行榜中顯示你的名稱	第一局結束後由你選填；可直接使用我們預填的隨機暱稱
國家／地區	在排行榜顯示國旗	依裝置的地區設定自動帶入；你可以在「設定 → 我的資料」修改
頭像圖示	在排行榜顯示你的代表圖示	由你從 App 內建的動物圖示中選擇；本應用程式不會上傳或儲存相片
遊戲紀錄（分數、答對題數、等級、遊玩時間）	計算與顯示排行榜、顯示你的進度與稱號	使用中自動產生
匿名使用紀錄（開啟次數、每一局與每一題的作答情形、點了哪些功能、裝置語言與 App 版本）	了解哪些地方太難或不好用，用來改進遊戲	使用中自動產生；使用另一組隨機代碼，不與你的暱稱或排行榜身分相連
閃退資訊（上一次異常結束時的錯誤類型與訊息）	找出並修正讓 App 閃退的問題	App 異常結束後，下次開啟時自動送出；不含暱稱或任何個人資料

我們不會蒐集：你的姓名、電子郵件、電話、生日或年齡、精確地理位置、通訊錄、簡訊或通話紀錄、相片或相機內容。裝置身分是隨機字串，不含任何可直接識別你本人的資訊。

若裝置離線，遊戲紀錄會先儲存在你的裝置本機，恢復連線後才會上傳到排行榜。

1-1. 網頁版（mathgameapp.app）

你也可以不安裝 App，直接在瀏覽器玩網頁版（mathgameapp.app/play）。網頁版與 App 的差異如下：

不需要帳號；想上世界排行榜才取暱稱：網頁版一般遊戲的成績只存在你的瀏覽器。你可以選擇取一個暱稱（請不要用真實姓名）上世界排行榜：這時網頁版會建立一組匿名身分（隨機識別碼，存在你的瀏覽器），之後每一局的成績會連同暱稱顯示在排行榜上，名字旁標示 🌐（網頁版玩家）。不需要 Email、電話或真實姓名。
網頁版暱稱與成績只保留 3 天：最後一次玩之後 3 天，暱稱與排行榜成績會自動刪除；下載 App 才能永久保留。我們每天檢查網頁版暱稱，不適當的暱稱（例如不雅字、真實姓名與學校、電話號碼）會被改回預設名稱，成績也會從排行榜移除。
匿名使用紀錄：與 App 相同，網頁版會送出匿名使用紀錄（開啟次數、每一局與每一題的作答情形、點了哪些功能、瀏覽器語言與版本），使用一組存在瀏覽器裡的隨機代碼，不含姓名或聯絡方式。
朋友挑戰：只有在你邀請朋友、或打開有效的朋友邀請碼時，網頁版才會建立匿名身分（同上），用來建立或開啟那一場挑戰、並交換這一場的成績；朋友挑戰裡不會顯示網頁版的暱稱。對戰紀錄只存在這個瀏覽器。
儲存與刪除：上述代碼、進度與匿名身分都存在你瀏覽器的網站資料中；清除瀏覽器中本網站的資料即可刪除。伺服器上的匿名身分若 30 天沒有使用（且近期沒有建立挑戰）會自動刪除；想提早刪除暱稱、成績或挑戰紀錄，可寄信至下方 Email。
網頁版不投放廣告，也不使用第三方追蹤 Cookie。網站由 Vercel 代管，Vercel 為了營運與安全可能會記錄連線的 IP 位址等技術資訊。

2. 我們如何使用這些資料

產生並維持你的裝置身分，讓你的成績能累積、重新安裝後不遺失。
顯示並計算世界排行榜名次。
儲存你的遊戲進度、等級與稱號。
「排名被追近」提醒：由你的裝置在本機比對排行榜後發出通知，不會把通知內容上傳；你可以在系統設定中關閉通知。

我們不會將你的資料販售或出租給第三方，也不會在本應用程式內投放第三方廣告。

3. 第三方服務

本應用程式使用下列第三方服務協助運作，這些服務會在其各自的隱私權政策下處理上述部分資料：

服務	用途	隱私權政策
Supabase	裝置身分驗證、資料庫與檔案儲存（保存上述身分與遊戲資料）	supabase.com/privacy
Vercel	網頁版與 mathgameapp.app 網站的代管（可能記錄連線 IP 等技術資訊）	vercel.com/legal/privacy-policy

4. 資料保存與刪除

你的資料會保存到你刪除為止。你可以隨時刪除你的所有資料：

在應用程式內：前往「設定 → 我的資料 → 刪除我的資料」。此操作會永久刪除伺服器上的裝置身分、暱稱、頭像、國家與所有排行榜紀錄，並清除裝置上的進度與統計，且無法復原。之後你會以全新的裝置身分重新開始。
或來信要求：寄信至下方聯絡 Email 並附上你的排行榜暱稱與國家，我們會協助刪除你的資料。

長期未使用且沒有任何成績與暱稱的裝置身分，我們可能會定期自伺服器清除。

5. 兒童隱私

本應用程式的目標對象為 13 歲（含）以上使用者，並非專為 13 歲以下兒童設計。本應用程式不要求任何個人身分資料：不需要姓名、電子郵件或帳號，裝置身分僅是隨機識別碼，我們也不會在知情的情況下蒐集 13 歲以下兒童的個人資料。若你是家長或監護人，希望刪除孩子裝置上的成績與暱稱，可在孩子的裝置上使用「刪除我的資料」，或透過下方 Email 與我們聯絡，我們會盡快處理。

6. 資料安全

資料透過加密連線（HTTPS／TLS）傳輸，並儲存於受存取控制保護的 Supabase 服務中。裝置身分儲存在裝置的安全儲存區（iOS 為系統鑰匙圈 Keychain，Android 為應用程式私有儲存空間）內，僅本應用程式可讀取。惟請理解，沒有任何網路傳輸或儲存方式能保證百分之百安全。

7. 本政策的變更

我們可能會不定期更新本政策。重大變更時會更新本頁面頂端的「最後更新日期」。建議你定期回來查看本頁。

8. 聯絡我們

對本隱私權政策有任何疑問，或想行使你的資料權利，請聯絡：
mrjc@mathgameapp.app

Math Game — Privacy Policy

Last updated: October 1, 2026

This Privacy Policy explains how Math Game (the Android / iOS app — Android package com.mrjc.mathgame, iOS bundle ID com.mrjc0509.countcard — the "App") collects, uses, and protects your information. The App is developed and operated by MRJC ("we", "us"). By installing or using the App, you agree to the practices described here.

In short: the App requires no account and no sign-in, and never asks for your name or email. On first launch we generate a random "device identity" that links your scores to the world leaderboard and recognizes you after a reinstall.

1. Information We Collect

While you use the App, we collect the following:

Data	Purpose	Source
Device identity (a randomly generated anonymous identifier)	Links your scores and leaderboard records together; recognizes you after reinstalling or moving to a new device	Generated automatically on first launch and stored in your device's secure storage (the system Keychain on iOS, app-private storage on Android)
Nickname	Displayed on the leaderboard	Chosen by you after your first game; you may keep the random nickname we suggest
Country / region	Shows a flag on the leaderboard	Taken from your device's region setting; editable under Settings → My data
Avatar icon	Shows your icon on the leaderboard	Chosen from the app's built-in animal icons; the App does not upload or store photos
Game data (scores, correct answers, level, play time)	Compute and show leaderboards, your progress and titles	Generated during use
Anonymous usage data (app opens, how each round and question went, which features were tapped, device language and app version)	Understand what is too hard or confusing so we can improve the game	Generated during use; sent under a separate random code that is not linked to your nickname or leaderboard identity
Crash information (the error type and message from the last abnormal exit)	Find and fix problems that make the app crash	Sent automatically the next time the app opens after a crash; contains no nickname or personal data

We do NOT collect: your name, email address, phone number, birthday or age, precise location, contacts, SMS, call logs, or photos. The device identity is a random string and contains nothing that directly identifies you.

When your device is offline, game data is stored locally first and uploaded to the leaderboard once you are back online.

1a. Web Version (mathgameapp.app)

You can also play in a web browser without installing the app (mathgameapp.app/play). The web version differs from the app as follows:

No account; a nickname only if you want to join the world leaderboard: scores from regular web rounds stay in your browser. You may choose a nickname (please do not use your real name) to join the world leaderboard. The web version then creates an anonymous identity (a random identifier stored in your browser), and your later rounds appear on the leaderboard with your nickname, marked 🌐 (web player). No email, phone number or real name is needed.
Web nicknames and scores are kept for 3 days: 3 days after your last play, your nickname and leaderboard scores are deleted automatically; get the app to keep them. We review web nicknames daily; inappropriate nicknames (for example rude words, a real name with a school, or a phone number) are reset to a default name and their scores are removed from the leaderboard.
Anonymous usage data: like the app, the web version sends anonymous usage data (how often it is opened, how each round and question went, which features were used, browser language and version), tied to a random code stored in your browser, with no name or contact details.
Friend challenges: only when you invite a friend or open a valid invite code does the web version create the anonymous identity described above. It is used to create or open that challenge and to exchange results for it; web nicknames are not shown in friend challenges. Your challenge history is kept only in this browser.
Storage and deletion: the codes, progress and anonymous identity above are kept in your browser's site data; clearing this site's data in your browser deletes them. Anonymous identities on our server that are not used for 30 days (and have not created a recent challenge) are deleted automatically. To delete a nickname, scores or challenge results sooner, email us at the address below.
The web version shows no ads and uses no third-party tracking cookies. The site is hosted by Vercel, which may log technical information such as IP addresses for operations and security.

2. How We Use Your Information

Create and maintain your device identity so that your scores accumulate and survive a reinstall.
Display and calculate world leaderboard rankings.
Save your game progress, level and titles.
"Someone is catching up" reminders: your device compares the leaderboard locally and shows a notification; nothing about the notification is uploaded. You can turn notifications off in system settings.

We do not sell or rent your data to third parties, and we do not show third-party ads in the App.

3. Third-Party Services

The App relies on the following third-party services, which process some of the above data under their own privacy policies:

Service	Purpose	Privacy Policy
Supabase	Device-identity authentication, database, and file storage (stores the identity and game data above)	supabase.com/privacy
Vercel	Hosting of the web version and the mathgameapp.app site (may log technical information such as IP addresses)	vercel.com/legal/privacy-policy

4. Data Retention & Deletion

Your data is retained until you delete it. You can delete all of your data at any time:

In the app: go to Settings → My data → Delete my data. This permanently and irreversibly deletes your server-side device identity, nickname, avatar, country and all leaderboard records, and clears the progress and statistics stored on the device. You then start over with a brand-new device identity.
Or by email: contact the email below with your leaderboard nickname and country, and we will delete your data.

Device identities that have been inactive for a long time and hold no scores or nickname may be periodically removed from our servers.

5. Children's Privacy

The App is intended for users aged 13 and older and is not directed at children under 13. The App does not ask for any personal identity data — no name, email or account; the device identity is only a random identifier — and we do not knowingly collect personal information from children under 13. If you are a parent or guardian and want to remove your child's scores and nickname, use "Delete my data" on the child's device, or contact us at the email below and we will handle it promptly.

6. Data Security

Data is transmitted over encrypted connections (HTTPS/TLS) and stored in access-controlled Supabase services. The device identity is kept in the device's secure storage (the system Keychain on iOS, app-private storage on Android) and is readable only by this App. However, no method of transmission or storage is 100% secure.

7. Changes to This Policy

We may update this policy from time to time. For significant changes we will update the "Last updated" date at the top of this page. Please review this page periodically.

8. Contact Us

For any questions about this Privacy Policy, or to exercise your data rights, contact:
mrjc@mathgameapp.app