Need help with my multiplayer card game.

Hi, I'm creating a multiplayer card game, I've done all the systems and I just need to do the multiplayer one.

I'll explain a bit hoy the game works..

• There are 4 players (2 players per team) and the teams are facing diagonally (Team 1: player1 + player3. Team 2: player2 + player4).
• After all the players have put a card on the table (There will be 4 cards on the table), the round needs to be finished and something (wich I don't know what) needs to evaluate the cards on the...

Need help with my multiplayer card game.