Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
4/25/2011
11:05:08 PM
Rare 31.6%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
4/22/2011
11:16:20 PM
Very Rare 5.5%
Team Building
Complete all test chambers in the Team Building co-op course
4/22/2011
11:11:47 PM
Rare 46.8%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
4/22/2011
10:39:39 PM
Ultra Rare 4.6%
Bridge Over Troubling Water
Complete the first Hard-Light Surfaces test
4/20/2011
12:27:52 AM
Common 62.8%
