Just copy paste the script in tamper monkey and go to play on https://pizz.uno/

Note: If the bot cannot connect anymore it can come from the socket.io version. See @require line to try to fix it yourself.

Note: Work for all cards on the tables (including deck)

During the game the websocket is receving events, as the updateState event is containing all informations on the actual game. I just connected a second websocket in the room, parsed the payload and edit the DOM to replace the card card back by the cards of the opposite player.