Co-op Marks

How to use Co-op Marks

Compare Binding of Isaac progress with your friends and pick what to play together.

  1. Add players. Paste a Steam profile link or Steam ID in the box at the top and press + Add player (up to 4). The profile and its game details must be public on Steam. Click a player's color circle to change their color.
  2. Share. The page address holds the player list, so just send the link to your friends.

Everything comes from public Steam achievements, so some things (hard mode, a few tainted marks, save resets) are best guesses. Reopen this anytime with the ? button.