This way you will find yourself inside Daedalus' labyrinth. There's a save point and a hidden experience chest in the bottom left corner of the first room.
You will also find a familiar switch - interact with it and change the cube's position. This way you will also trigger a fight. It will be a little harder than usual, but you should okay, especially considering the Cerberus which you can "mount".
After the fight ends, move on to the next room, open the power-up chest found there [!!!] (on the left) and then interact with the switch.
The cube will turn and you'll land next to two chests (on the right): one with experience, the second one with a power-up [!!!] [LS]. Open them one at a time so that the fire doesn't reach you - it will appear once every couple seconds and by touching it you automatically die.
On the left there will also be a fire mechanism. Once it turns off, run there, grab the grating and quickly climb up.
Hold on to the moving object. Approach its right edge and wait for it to get close to another grating. Once it does, jump onto it [LS]. Afterwards, as the last moving mechanism retreats, get onto the top and jump onto another one. You will find a lever which opens a passage - pull it.
Go outside and cross the bridge (it's completely safe) to get to another room.
There's another puzzle waiting for you here. On the ground (apart from an experience chest on the right) you fill find a movable block. Move it to the middle part of the platform and then change the cube's position by hitting the switch. Afterwards move the block once more, this time to the upper part (away from the camera) and use the next switch.
This way you have moved the block near the pressure switch. Put it onto the switch and head to the exit.
A fight will begin, during which it will be very easy to die, even on the lowest difficulty. The cube you're in is filled with spikes which will appear from the floor - getting hit by them causes an instant death. To make things easier, the process is divided into two phases: at first just the tips of the spikes will appear, the whole will move out afterwards. If you see the tips underneath your feet, quickly run to another part of the room.
There's a whole cast of enemies that will try interrupt you. Basically you should keep moving all the time and let the spikes finish them off.
By the end of the first and second phase the whole floor will be filled with spikes. A Harpy will also appear, so grab it to save yourself (try to get the moment right, as grabbing too early will result in you falling on the not yet retracted spikes), just like you do when crossing gaps.
After you survive the second phase, an exit will open up [RS] - use it to get out.
Cross another bridge, save your game and go to the cage at its end (you will open it by destroying the crystal lock with the Cestus. Inside you will find Pandora.
After the cutscene go out and collect the power-up from the chest on the right [!!!]. Afterwards follow the path to its end, grab the girl (Circle) and give her a leg up.
In the next room you will have to go through a longer and harder than usual fight. Enemies will appear for quite a long time, with Gorgons amongst them (finish them off with QTEs to petrify the other). On the left you will find a hidden experience chest.
Once everyone's dead, pull the nearby lever and let the girl go through the grating. She will stand on a button and unveil to you a switch which will chance the cube's position.
Once it happens, the girl will find herself in a deadly trap, with saws approaching her. You have only a couple second to save her. Jump onto the green gratins and quickly move left. Afterwards jump onto the upper moving part and then jump onto the lower one again, once you're on the other side. Jump down to the ground once there and pull the lever.
If you were fast enough, Pandora will be saved. Now give her a hand once more and she will get behind the nearby grating. While she's climbing up the ladder, you can collect some experience from the chest on the left.
Go through the opened grating, grab the ladder and head up.
Once you get to the top you will find Pandora trapped in a tank which will start to be filled with water in just a moment (once you move the first object). Before you begin the rescue mission, collect the Minotaur Horn [!!!] from the hidden chest on the right.
Now you can try to save Pandora. As you switch on the mechanism (by moving the wall on the left [LS]), you will have a short amount of time to save Hephaestus' daughter. Move the mentioned block and run up the vertical wall. Afterwards glide towards the tank.
Once on it, jump to the vertical grating on the right and move out the block. Grab the ceiling, go up and activate the switch there to change the cube position.
After that quickly move along the ceiling on which you've landed again or you'll end up in the fans (you'll only have a couple seconds to do this). Move towards the wall under the tank and wait until the moving spiked platform gets beneath you. Then quickly climb up the grating onto the tank.
Move the crank to unveil a switch. Use it to change the cube's position again.
This way you will pump the water out of the tank and will be able to break the glass, freeing Pandora.
Once reunited, go across another safe bridge (there a save point on it). At the end of the path there's a lift which will take you down.
After the lift stops, you're in for another long fight. The enemies will appear for a long time and among them will be the troublesome Minotaurs.
After the fight, collect the chests hidden on both sides of the room. On the left you will find experience and on the right a power-up [!!!].
Now pull the lever to open the gate for Pandora. As she gets inside, you should get onto the switch above her and leave the labyrinth by going up.
Now go straight in the direction of the save point. Upon reaching it a cutscene will start and the stage will come to an end.
Get there by using the cubes most to the right side. There are hidden chests on the first and last of them (a power-up and Minotaur Horn) [!!!] [!!!].