Updated Title Publisher
Updated Title Publisher
Updated Title
Published Title Score Editor's Choice Publisher
Published Title Publisher

Professor Portal

After completing co-op, complete Calibration Course online with a friend who hasn’t played before

Trophy/Achievement Icon
Game: Portal 2
Service:
Rarity: 5.70% (Very Rare)
Tags: (None)
No Comments
No Upvotes
User profile pic

Comment submission error:

The comment must be at least 1 character in length.

GG logo

Register to continue…

Already have an account?

Log in to continue…

Forgot?
Gamer Guides Premium


Get access to this feature and a lot more by upgrading to a premium account.

Find out more

Already subscribed?