Google 登录是可选的。游客仍可玩单人和联机；游客最快纪录、语言和外观仅保存在当前浏览器。
登录由 Google Firebase Authentication 提供，该服务处理 Google 账号标识、邮箱及基本账号资料以验证身份。游戏成绩服务保存账号标识、游戏昵称、计时挑战最快成绩、赛道、圈数和更新时间；使用安全会话 Cookie 保持登录，退出会使当前会话失效。
公开排行榜仅显示游戏昵称和成绩，不显示 Google 邮箱或账号标识。请勿将真实姓名或联系方式填写为游戏昵称。计时输入会发送至 Cloudflare 服务器进行回放校验，不长期保存完整回放；成绩保存在 Cloudflare D1。
游戏未启用 Google Analytics，也不读取你的 Google Drive、邮件或联系人。登录弹窗若取消，仍可继续游客游戏。
Google sign-in is optional. Guest records, language and appearance stay in this browser. Firebase Authentication processes your Google identity, email and basic account details to authenticate you. The game stores a user ID, chosen racer nickname, best time-trial results, circuit, lap count and update time in Cloudflare D1. A secure session cookie keeps you signed in; signing out invalidates that session.
Public leaderboards expose only racer nicknames and results, never your email or account ID. Avoid using personal information as your racer nickname. Time-trial inputs are sent to our Cloudflare service for replay validation; full replays are not retained. Google Analytics is disabled. We do not access your files, email or contacts.
隐私联系 / Privacy contact: ziwei167@gmail.com
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