Schrodinger's Catch
Catch a blue-painted box before it touches the ground
5/22/2011
5:36:48 PM
Very Rare 6.9%
Final Transmission
Find the hidden signal in one of the Rat Man's dens
5/22/2011
3:46:21 PM
Very Rare 7.7%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
5/22/2011
12:35:44 AM
Very Rare 6.0%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
5/22/2011
12:20:06 AM
Rare 31.6%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
5/21/2011
10:34:18 PM
Rare 15.7%
Party of Three
Find the hidden companion cube in co-op test chamber
5/21/2011
10:31:54 PM
Ultra Rare 2.9%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
5/21/2011
9:17:56 PM
Ultra Rare 2.8%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
5/21/2011
9:09:28 PM
Ultra Rare 3.9%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
5/21/2011
9:00:59 PM
Very Rare 5.5%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
5/21/2011
8:57:55 PM
Ultra Rare 4.6%