Host-validated four-player demo
Four-player color-match card game
An UNO-style showcase for hidden hands and host-validated turns. The setup service only connects peers; the host browser owns this demo's deck, hands, turn order, and rule validation.
Lobby
Up to four players. Start with any 2–4 connected players.
or
Not connected.
Lobby chatPeer to peer
Bad-message probe
These buttons deliberately behave like a modified client. The host must reject the intent instead of trusting the sender.
Start a game to exercise the validation boundary.
This stops guest-side message forgery, but it does not make the host trustworthy. The host still sees every hand and chooses the shuffle seed; competitive hidden-information games need a trusted gameplay server or a verifiable multi-party shuffle/commit-reveal protocol.