To join a game in Twenty One on Roblox, open the game page and click the green play button, or create a closed room and start a bot match if you want solo practice. Roblox’s help also says you can join another player’s session from their profile if they’ve enabled joining and the experience permits it.

Fast steps

  1. Open Roblox and search for Twenty One.
  2. Tap or click the game.
  3. Press Play on the game page.
  4. If you want to play with a friend, go to their profile and use Join Experience when it appears.
  5. If joining does not work, the room may be full or the player may have privacy settings turned on.

In Twenty One

The game is a 1v1 card-based survival experience where the goal is to reach 21 and beat your opponent. A beginner guide says you can draw a card, hold, or use a trump card depending on the round and your hand. The game page also notes that you can create a closed room and click start to play against a bot.

Common problems

  • The Join option may not appear if the player is not allowing joins.
  • You may be blocked by the experience’s permissions or a full server.
  • If you just want to get into the game itself, use the main game page’s play button instead of trying to join a friend.

Simple example

If your friend is already in Twenty One and has joining enabled, open their Roblox profile and tap Join Experience. If you only want to play immediately, open the Twenty One game page and press Play.

TL;DR: Search for Twenty One on Roblox, press Play, or join a friend through their profile if they’ve allowed it.