Four Ring Circus
Enter 4 different portals without touching the ground in co-op
5/8/2011
9:49:48 PM
Ultra Rare 4.6%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
5/8/2011
9:30:08 PM
Rare 20.6%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
5/5/2011
4:43:47 PM
Ultra Rare 2.1%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
5/5/2011
4:30:52 PM
Very Rare 5.5%
Final Transmission
Find the hidden signal in one of the Rat Man's dens
5/5/2011
3:31:52 PM
Very Rare 7.7%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
5/5/2011
3:10:12 PM
Very Rare 6.9%
