Unlock 3D Prince of Persia level
Hold X and press space, left mouse, E, C, E, Space, left mouse, C

Unlock Original Prince Of Persia Room
Start a new game and while on the balcony of Farah's room, hold X and press SPACEBAR, LEFT MOUSE BUTTON CLICK, E, C, E, SPACEBAR, LEFT MOUSE BUTTON CLICK, C. Note that these are the default controls for POP.

Life Lengthener
Go to the checkpoint (sand vortex) that is named "The underground reservoir" Get through this area, and when you get to the rope that leads you out, don't climb out, there is a platform around the middle of the rope, swing there and press jump. You will find yourself in a series of traps. Go to the one in which spiked bars appear in the wall and when the bars retreats, wall run up and press jump. You will find yourself on a bar that stretches vertically, climb down the bar until you find a bar that stretches horizontally. Swing on it and jump. Do this again and again until you find yourself on another platform. Find a broken door, strike it three times and proceed. To get back, go the way you came and climb out of the reservoir.

Slipping:
Go in some water and run up the wall. Either way you will still slip.

Angry Farah:
Any time you are alone with Farah, take out your sword and hit her once (you might kill her). She should yell at you and shoot you with her bow.

Hidden life Lengthener
To get this, you must start out beside the checkpoint (sand vortex) that is named "Farah, come back". You start out on a platform. To your right, you see a small bit of railing missing. Run at it so that you are hanging on the space between the railings. Drop down and you will find various obstacles (ledges, beams, and a bar) Swing on the bar and press jump. You will be in a small room. On your left there is a broken door. Strike it with you great sword once and it will break, and then proceed. After you had full healing/life lengthened then run on the wall in front of the hole that you entered and press jump again. You will swing on a switch that opens a door above you. Keep on swinging and press jump again. You will be on another bar, keep on swinging and press jump again. Climb out of the door, and you will be back where you started.