11.65%
Fingerprinter
Smear your dirty fingers over Aperture's beautiful glass
12.62%
Two times the charm
Solve the Chamber 6-2 twice
13.59%
Supply Chain Problems
Deplete the gel supply in Chamber 4-11
14.56%
Pacifist
Complete the Chamber 4-9 without knocking over any turrets
15.53%
Just in time
Deplete the conveyors' supply of Weighted Storage Cubes
15.53%
Refreshing shower
Take a shower under one of the gel cleansing fields
16.50%
Still a pacifist
Complete Chamber 5-1 without destroying any turrets
20.39%
Captivating Looks
Stare at Conly's mannequins for a really long time
20.39%
Endless loop
Fling in an endless loop in Chamber 4-11
25.24%
The fun solution
Solve Chamber 6-6 the fun way
26.21%
Bullseye
Get the ball in 4-10 to land perfectly in the socket
31.07%
Sending a message
Blow up a test chamber sign