When playing through Portal, you will periodically encounter spots on the game map that will give you an additional character to add to your team. These characters are powerful and don't need to be unlocked in your main game to be usable in Portal, but they can only be used in Portal. When you complete all Portal areas for the day, you will start over on the next day without these extra characters.
What are the characters I'm getting in Portal?
Last Updated: 53d