YugiDoku is a free fan game made by Card Prices. We keep only what the games need: your results, your progress and enough to know it is you. We don't sell data and we don't show ads.
What we store
- Playing as a guest: a random guest ID in a cookie, plus your game results. Guest records are deleted automatically after 90 days without play.
- Signing in with Card Prices: your account ID, display name, avatar and a one-way hash of your email. The hash only lets a Discord login with the same email join your account. Card Prices handles your password; YugiDoku never sees it.
- Playing in Discord: your Discord user ID, name and avatar. If you allow it, your verified email is used the same one-way way.
- Game data: puzzles played, guesses, scores, XP, streaks and duel results. Leaderboards and shared results show your display name, avatar and rank.
- Abuse protection: a short one-way hash of your IP address, kept for about two hours, to rate-limit floods and bots.
Cookies and storage
yd_session: keeps you signed in.yd_guest: your guest ID.yd_oauth_state: lasts 10 minutes during a Discord sign-in.- Your device also remembers settings like sound and graphics quality.
- No advertising or cross-site tracking cookies.
Services we use
Vercel (hosting and cookieless page analytics), MongoDB Atlas (database), Sentry (error reports, which include technical details about the failure), Discord and Google (only when you sign in with them) and Card Prices (accounts and card data).
Your choices
- Delete everything YugiDoku stores about you from your profile ("Delete my YugiDoku data"). Your Card Prices account is separate and stays.
- Sign out, or clear this site's cookies, at any time.
- Questions or requests: reach us on Discord or @Card_Prices.
Children
YugiDoku is not directed at children under 13, and we don't knowingly collect their data.