The tests start out simple. Chell has to pick up boxes, called Weighted Storage Cubes (Cubes for short), and put them on buttons, which will open the door to the exit of the chamber. At this point, GLaDOS speaks to Chell as a guide, praises her, and promises her cake when the tests are over. Near the beginning of the game, Chell gets the Aperture Science Handheld Portal Device, also known as the Portal Gun. At first, her Portal Gun only makes blue portals and the orange portals are made by GLaDOS. Later, Chell gets the full Portal Gun and can make both blue and orange portals.