From VPchat, go to the Games menu. Choose Start Game.
From the list, select the game you want to play. Click OK.
Once you've started a game, a game board with your Avatar will replace the chat room background.
A miniature version of this board appears in the room where you were when you started the game.
When others join your game, their Avatars will also appear on the board.
Finally, a Game Tab appears at the bottom of the chat window.
You can chat with others playing the game using this tab.