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

Show that pit who's boss

Use an Aerial Faith Plate to launch a turret

Break the rules in Test Chamber 07

Hit a Player with a Snowball while falling into the Lava.

Take out helicopters with remote missile 3/3.

Complete all test chambers in the Team Building co-op course

Place a cube on a button without touching the cube

This is that part

Do the same test twice

Master the Propulsion Gel

Discover the missing experiment

Master the Repulsion Gel