10.78%
Fingerprinter
Smear your dirty fingers over Aperture's beautiful glass
11.76%
Two times the charm
Solve the Chamber 6-2 twice
12.75%
Supply Chain Problems
Deplete the gel supply in Chamber 4-11
13.73%
Pacifist
Complete the Chamber 4-9 without knocking over any turrets
14.71%
Refreshing shower
Take a shower under one of the gel cleansing fields
14.71%
Just in time
Deplete the conveyors' supply of Weighted Storage Cubes
15.69%
Still a pacifist
Complete Chamber 5-1 without destroying any turrets
19.61%
Endless loop
Fling in an endless loop in Chamber 4-11
19.61%
Captivating Looks
Stare at Conly's mannequins for a really long time
24.51%
The fun solution
Solve Chamber 6-6 the fun way
25.49%
Bullseye
Get the ball in 4-10 to land perfectly in the socket
30.39%
Sending a message
Blow up a test chamber sign