CodeDuel
Challenge your friends. Crack the code.
A turn-based code-breaking game for friends, siblings, and rivals. Two players. Four digits. One winner.
Pick four different digits from 1–9. Keep your code secret, take turns guessing your rival's code, and use each clue to plan your next move. CodeDuel tells you how many digits are in the right position and how many belong somewhere else — without telling you which ones. Crack all four first to win, or sharpen your deduction skills against the vault in solo practice.
Code-Cracking Deduction
Four unique digits, nine possible numbers, and text clues that make every guess useful.
Challenge Your People
Create an invite-only room and share its five-character code or invite link. No public matchmaking.
Practice Against the Vault
Play solo against a randomly generated secret code, then start again with a fresh challenge.
An Arcade Feel
Animated code tiles, sound effects, and haptic feedback bring your moves to life. Reduced-motion settings are respected.
Set your code
Invite a friend, then each choose four different digits from 1–9.
Guess
Take turns guessing. Read how many digits are correctly placed and how many are in the wrong position.
Win
Be the first to crack the code.
Yes. Practice Solo generates a secret code for you to crack without another player.
Friends, siblings, family — anyone you invite. CodeDuel is not limited to couples.
No. Multiplayer rooms are joined through an invite code or shared link.
No. Each code contains four different digits from 1–9. Zero is not used.
Invite-only play. Clear data details.
Solo practice runs on your device. Online duels use Firebase authentication and cloud storage to connect players and synchronize game state. Read the privacy policy for details.