You hold one card. Draw one, play one, and use what it does to work out what everyone else is hiding. Knock the others out — or hold the highest card when the deck runs dry. 2–8 players, peer-to-peer: no accounts, no server, just a room code. Short on friends? Add bots.
An unofficial fan implementation of Love Letter by Seiji Kanai (© Z-Man Games / Asmodee), using the Premium edition's expanded cast. 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!