Your team shares four secret keywords. Each round, one of you transmits a 3-digit code with three clues — clear enough for your teammates, cryptic enough that the other team can't crack the pattern. Intercept twice to win; garble your own transmission twice and you lose. Two teams of 2–4, peer-to-peer: no accounts, no server, just a room code.
An unofficial fan implementation of Decrypto by Thomas Dagenais-Lespérance (© Le Scorpion Masqué). Multiplayer runs over WebRTC: browsers find each other with Google STUN servers and a free signaling broker, then talk directly. The room lives in the host's tab — keep it open!