Portal 2 Walkthrough

4. Co-op story walkthrough

For this part of the game I recommend a good friend which has at least a slight knowledge of the game since otherwise it will be a pain to do. Both of the players should make sure they know exactly which portal to place where and teamwork is the key for success. Also make sure to be on each other's friends list. Having a second profile for the "Professor Portal" achievement is also HIGHLY recommended, but actually isn't needed.

First off the game starts in a little video sequence where you see both players being attacked (yeah, you don't play as humans). After some short calibration where you basically have to use the ping tool, gestures and after your first little co-op testing chambers, you will get your first achievement. Now you will be able to start the co-op mode for real!

High Five6 (5)

Celebrate your cooperative calibration success

• Unlocked by 47,787 tracked gamers (78% - TA Ratio = 1.13) 61,491

The hub is basically your starting and meeting point, something like a lobby, where you can enter the various test chambers. Don't be mistaken, some test chambers have to be unlocked through gameplay, so don't be confused if you can only see/reach about 3 chambers at the beginning.

Before we start any chambers, we will hammer out a few achievements but you can get these anywhere. Browse through your gestures menu and stop on the rock-paper-scissors gesture. This will unlock after some missions, but if your partner already has it, he can initiate it as well. Simply win 3 times in a row and the achievement is yours. This is purely based on luck and totally random in my opinion, but the game will grant it to you just keep trying.

Rock Portal Scissors27 (20)

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

• Unlocked by 33,317 tracked gamers (54% - TA Ratio = 1.36) 61,491

Now open a portal underneath your partner, let your partner make a gesture and place the 2nd portal somewhere else to break the gesture and net you another achievement:

Narbacular Drop35 (25)

Place a portal under your co-op partner while they are gesturing

• Unlocked by 30,570 tracked gamers (50% - TA Ratio = 1.42) 61,491

Now for using all the portals without touching the ground. One player opens a portal on the ground and puts the 2nd one close to it. Jump into it from some height to gain momentum. There are 2 ways to continue: either be fast and replace the portals with your own as the non-jumping player passes through them, or place 2 portals close to the previous ones so that the jumping player can reach all 4 without touching the floor in between. If done right, the achievement for doing that should unlock:

Four Ring Circus42 (25)

Enter 4 different portals without touching the ground in co-op

• Unlocked by 21,648 tracked gamers (35% - TA Ratio = 1.68) 61,491

Keep the portals and jump in either set of them. Now press up on the D-pad to initiate a gesture in the air. Do this one more time and another achievement will unlock:

Air Show27 (20)

Perform 2 aerial gestures before touching the ground in co-op

• Unlocked by 33,607 tracked gamers (55% - TA Ratio = 1.35) 61,491

After some short orientation head for the first test chambers which should be called "Team Building". On the first stage, right before the end, make sure to do your high-five gesture (ANY gesture will suffice!) in the camera to go toward "Asking for Trouble". Usually at the end of the first chamber in each stage there is a camera to gesture at. Keep that in mind.

And after those 6 easy opening stages you get:

Team Building12 (10)

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

• Unlocked by 44,614 tracked gamers (73% - TA Ratio = 1.17) 61,491

I found a few videos to help those that struggle.

Now we move on to Course 2: Mass and Velocity. On chambers 1-3, use the following video to complete all three chambers in under 60 seconds:

Triple Crown31 (15)

Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each

• Unlocked by 14,856 tracked gamers (24% - TA Ratio = 2.03) 61,491

Again, don't forget to gesture for the camera; Asking for Trouble is nearing up on us! On to chamber 6, follow the video:

Kudos to Pullen101 and SPREEproductions, respectively.

Iron Grip36 (20)

Never lose a cube in Chamber 6 of the Mass and Velocity co-op course

• Unlocked by 18,479 tracked gamers (30% - TA Ratio = 1.82) 61,491

Then after you complete all the other stages you get:

Confidence Building12 (10)

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

• Unlocked by 39,562 tracked gamers (64% - TA Ratio = 1.25) 61,491

Here comes Course 3: Hard-Light Surfaces.

Upon getting to the very first room with a light bridge and water, attach it anywhere you see fit above the water, let your partner walk onto it and have him perform any gesture. Now put the bridge somewhere else and he will fall to his death for an achievement:

Empty Gesture39 (25)

Drop your co-op partner in goo while they are gesturing by removing the bridge under them

• Unlocked by 25,541 tracked gamers (42% - TA Ratio = 1.55) 61,491

I also found a video to specify it a little bit more and I don't take credit for it.

Now get to chamber 3 and beat it with no more than 5 portal placements. This is easily done if you know how and in case you should get stuck, I have found a video for that.

Portal Conservation Society37 (20)

Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements

• Unlocked by 17,760 tracked gamers (29% - TA Ratio = 1.86) 61,491

Now simply play through the rest of the chambers for the achievement. Don't forget to gesture in front of a camera at least once per chapter! I also found some videos which I don't take credit for.

Bridge Building20 (15)

Complete all test chambers in the Hard-Light Surfaces co-op course

• Unlocked by 34,287 tracked gamers (56% - TA Ratio = 1.34) 61,491

Now we REPLAY chamber 6 and place a barrier in front of a turret. Use the dance gesture and taunt the turret and it will result in a neat achievement for you.

Can't Touch This15 (10)

Dance in front of a turret blocked by a hard light bridge in co-op

• Unlocked by 28,525 tracked gamers (46% - TA Ratio = 1.47) 61,491

Course 4: Excursion Funnels is our second to last course. Almost done! Use this video courtesy of Community Achievement Hunters Nand and Soothsayer57 for Still Alive, which requires you to do the ENTIRE course without dying. This isn't cumulative, which means if either of you die once, you have to start over from the very beginning, so be careful.

Still Alive35 (15)

Complete Course 4 with neither you nor your co-op partner dying

• Unlocked by 11,487 tracked gamers (19% - TA Ratio = 2.31) 61,491

The next achievement requires you to be alive the whole course and should unlock at the same time as Still Alive. Don't forget the gesture at the camera!

Obstacle Building21 (15)

Complete all test chambers in the Excursion Funnels co-op course

• Unlocked by 31,296 tracked gamers (51% - TA Ratio = 1.40) 61,491

Now we REPLAY chamber 9 and search for the companion cube. Follow the video provided down bellow and you shouldn't have any trouble finding it. I again don't take any credit for it.

Party of Three44 (25)

Find the hidden companion cube in co-op test chamber

• Unlocked by 19,598 tracked gamers (32% - TA Ratio = 1.77) 61,491

Alright. We've made it. Course 5: Mobility Gels. As soon as you reach the camera of the first stage, make a gesture to unlock a hard earned achievement:

Asking for Trouble16 (10)

Taunt GLaDOS in front of a camera in each of the five co-op courses

• Unlocked by 23,515 tracked gamers (38% - TA Ratio = 1.62) 61,491

Now stand still and perform every single gesture you are able to perform. This will net you another achievement since you should've unlocked each available gesture (you will also earn 1 hug towards another achievement!)

Gesticul-821 (15)

Perform all 8 gestures of your own volition in co-op

• Unlocked by 31,891 tracked gamers (52% - TA Ratio = 1.39) 61,491

Breeze through the rest of the chambers and sack the achievement for beating the game once and for all!!

I found another set of videos for those that need them, again, i take no credit!

You Saved Science145 (100)

Complete all test chambers in all courses of co-op

• Unlocked by 29,101 tracked gamers (47% - TA Ratio = 1.45) 61,491

Now Professor Portal requires you to play Calibration Course online with a friend who hasn't played before. That means they have to have never played co-op AND have to be on your friends list. They cannot have completed Calibration Course or have been in any chambers. It must be done online, split-screen doesn't count. Also, you must have beaten the coop and been awarded You Saved Science. If all of those requirements have been met congrats:

Professor Portal167 (75)

After completing co-op, complete Calibration Course online with a friend who hasn’t played before

• Unlocked by 12,391 tracked gamers (20% - TA Ratio = 2.23) 61,491

Hug the player afterwards and you should now 2/3 hugs. Get online and search for any player, hug him once and watch your final coop achievement unlock before your very eyes. What a tremendous sight!

Friends List With Benefits115 (50)

While playing co-op, hug 3 different people on your friends list

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