It has the white rooms from Portal.
The main gate with the nine squares
Lower the red cubes to create a passage.
The blue cube can be used to launch yourself.
Creating a series of platforms with red and yellow cubes.
The green cube can be reset by pressing the large button.
In this section you need to guide the green ball past a series of hazards.
Use these arrows to rotate a section of the room.
Cubes can be manipulated from a distance as well.
A difficult section where you need to guide a green ball through the green square in the back.
Here the ball changes its colour based on the cube it runs through.