Show that pit who's boss

Take GLaDOS' escape advice

Complete all test chambers in the Mass and Velocity co-op course

Win 3 co-op games of rock-paper-scissors in a row

Find the hidden signal in one of the Rat Man's dens

Break the rules in Test Chamber 07

This is that part

Do the same test twice

Master the Propulsion Gel

Master the Repulsion Gel

Stand in a defective turret detector

Complete the first Hard-Light Surfaces test

Reunite with GLaDOS