Chamber 01
Here, you simply need to get to the other side. O climbs up the only ledge with C (only O opens portals here ). Before this , C places a portal in the wall that O couldn't reach. Afterwards, C places a portal on the only white floor, and O jumps there with C. In the second room, you need to simultaneously press two large red buttons. O climbs up the only ledge.
C places a portal in the wall that O can't reach. Afterwards, C places a portal on the only white floor, and O jumps there. Now C goes up on his own, where he places a portal in the wall opposite the second large red button and jumps into his portal from below ( O is inactive at this point).
You've received a rounded cube, which will open the exit. P.S. I initially wrote about the second room, but then noticed an omission and corrected it with copypasta (how monotonous the games are).
Chamber 02
O places a portal above and below the electric field. S jumps into infinity. O presses a button and opens the upper portal on the inclined surface. Now S does the same for O.
Chamber 03
The beginning is the same here ( O places a portal above and below the electric field ahead). Instead of the inclined surface, O opens an upper portal in the wall opposite the cube dispenser. Now C summons the cube, and O stands on the button to prevent it from falling into the unknown.
Once on solid ground, C should hand the cube to O , who should immediately run to the platform above (this way you'll bypass the electric field). Now calmly proceed to the exit (you'll open at least two portals).
Chamber 04
O places a portal above and below the electric field located to the side of the entrance.
Here, S should be prepared to press the buttons he'll hit during his flight (he doesn't need to move through space, so let go of WASD).
O places the upper portal on the floor, under one button, and then (after 1-2 seconds) places the second portal, which was below, on the floor, under the second button.
These combinations of actions lead you to the exit.
Chamber 05
In the first room, there's no need to think: one portal is on the ceiling under the Faith Panel, and the other is on the inclined surface.
In the second room, O places portals as in the previous room, and C , standing behind the field, places portals on either side of the barrier.
The portal O placed on the inclined surface must now be placed on a second inclined surface, after which C must stand on the Faith Panel.
O , in turn, enters the portal he created for C to reach the Faith Panel, and from there to the exit.
In the third room, first take the cube.
O must fly through the electric field to the button where the cube will be. To prevent the cube from breaking, C must pass it to O. Now
O must enter the opened passage. There, he places two portals on the two surfaces that are there. Afterwards, C must fly towards O to eventually reach the exit. There is a wall at the exit from which O must emerge ( C cannot abandon his partner).
Chamber 06
O crosses the field and places a portal on two inclined surfaces he sees. S climbs to the Faith Panel and later places portals on two other inclined surfaces he sees. S steps on the Faith Panel and flies toward the exit and the button he must press.
The cube will also reach the exit, but its place is on the button below. O places the cube on the button, then goes to the Faith Panel, and from there to the exit (don't forget to remind your partner to open the portals opposite him). In the second half of Chamber 6, you need to time it perfectly.
O goes to the exit, and S places a portal on the inclined surface and on the tabloid near the entrance. Now O steps on the Faith Panel, which will lead him to S (you don't need to go to S ). S must press the button next to him when O is halfway to the second Faith Panel (the first Faith Panel is the starting point).
If you did everything as I described, O will meet the cube. Now comes the hard part: you need to get the cube to the exit without dropping it in the water. The cube is on the button, and you're in chamber 07.
Chamber 07
In the first room, place portals on your halves and, on the count of three, jump onto the faith panel, then press the button. O places a portal opposite the corridor and the laser receiver, takes the cube, and aims the laser at the laser receiver. S, meanwhile, steps onto the elevator, places a portal on the floor opposite the faith panel.
Pressing the button at the end of the corridor saves O. In the second half of the second room , O carries the cube to the faith panel, places the cube on it, and runs through the portal S placed. S places the portal above the entrance and next to the faith panel.
Chamber 08
First, you need to get the cube.
C places portals to press the red button on the pipe.
O places portals to fly over the pipes.
After the second signal, O must jump into the portal and grab the cube.
O uses the cube to aim the laser at the laser receiver, which will stop the fan.
At this point, C places a portal opposite the fan and on the floor to gain speed. After making sure the fan has completely stopped, C jumps.
O places the cube and places a portal opposite the window of the house and on the wall next to him (the only wall that is level with the laser). O takes the cube and aims the laser at the window of the building.
C places a portal opposite the laser receiver and on the wall, which burns through the laser.
O must get to C to simultaneously press the lever, which will open the path to the goal.
The disk is easier to find than in the first case. Insert it and enjoy...
Portal 2: Co-op Walkthrough:
Course 2: Mass Velocity
Source: playground.ru, gamerguides.com