Challenge Mode

Challenge Mode

Video tutorial by fin

Challenge Mode is a special feature added in the Peer Review DLC, allowing the player to compete with their friends for the lowest completion time and the least amount of placed portals in each level.

Least Portals

Main page: Least Portals

Unlocking Non-CM Levels

There are 11 levels in the singleplayer campaign that are not natively available in Challenge Mode. However, it is possible to get them with simple game file modification. To obtain these levels, download this file, and install it into a DLC folder.

1. Create a new folder in your Portal 2 directory called portal2_dlc#, replacing the # with the next number of folders already existing (by default, portal2_dlc2 is the highest folder, so you should create portal2_dlc3 if this is the case.)
2. Place the pak01_dir.vpk file into this new folder, and restart your game.

Keep in mind that scores from these missing levels are not updated automatically on the CM leaderboard. Because of that, you have to submit scores manually, or using autosubmit. The in-game leaderboard, however, still works fine.