Portal 2

After completing the Calibration Course, you will be sent to a Hub World. This is where you will travel around to different courses throughout the course of co-op. At first, only the first course is open, but the further you progress in co-op, the more courses will be unlocked. They will get harder and harder with every new course you go through, as each one builds off of it's predesessor. There are 5 courses in all that you must complete for this trophy. They are as follows:

1. Team Building - There are 6 test chambers in this course, and they are all pretty easy. Here you will learn the basics of portal placement, using cubes, flinging yourself across spaces, etc. You will also learn how to utilize things like the countdown timer for precise movements with your partner. You shouldn't have much of a problem completing this course.

2. Mass and Velocity - There are 8 test chambers in this course. You will be introduced to aerial faith plates, and learn about using precise timing between you and your partner to accomplish a task. Remember you will also have to utilize what you learned in course 1 (such as 'flinging' with portals) in order to solve these test chambers. They start out fairly easy, but they can get a little tricky by the end, especially test chamber 8, where you must redirect a laser into an office building for your partner.

3. Hard-Light Surfaces - There are 8 test chambers in this course. This is the turning point in co-op where things start to get a little more complicated and require you to think more to solve them. You will learn about hard-light bridges in this course, and how to use portals to revolve them at different angles to do various tasks. Some tests can be quite tricky at times to solve, and at the end of the course, you will have to deal with turrets shooting at you and your partner. Overall, just be prepared for the difficulty to ramp up a bit while going through this course.

4. Excursion Funnels - There are 8 test chambers in this course. With all of the turrets, lasers, and bottomless pits in this course, it can be quite difficult your first time through. You will be introduced to excursion funnels in this course, which, when combined with portals, you can use for all sorts of things from floating across a giant chasm to placing a cube on a ceiling button. The test chambers can have many various parts to them, and you and your partner might have to do some trial-and-error if you get stuck somewhere. There's only one more course after this, so keep your confidence up!

5.Mobility Gels - This is the final co-op course in the game. There are 8 test chambers in this course. You'll have to use all of the knowledge that you've learned so far throughout co-op to complete this course. This course contains some of the most difficult and unique test chambers in the game, containing everything from turrets, to hard-light bridges, to excursion funnels. You will also have to make good use of both of the gels you get in this course, as they are the key to solving a lot of these chambers. Don't get frustrated if you get stuck, because there's a chance that you will get stuck a lot in this course. Just keep a clear head and don't be afraid to experiment a bit with what you find in the test chamber, even if it means one of you ends up dying because of it. Once you complete the last test chamber in this course, you will be shown a cutscene, and your trophy will soon pop after.

If you experience any glitches, or this trophy doesn't unlock, refer to this thread:

You Saved Science did not unlock