Weighted Storage Cube
The Weighted Storage Cube was first introduced in Portal, and remains prevalent in Portal 2. In Portal 2, the blue ring turns yellow when placed upon a Heavy Duty Super-Colliding Super Button.
Weighted Companion Cube
The Weighted Companion Cube was first introduced in Portal, and remains prevalent in Portal 2. It functions in the same way as a regular Storage Cube, being differentiated only to help players to feel attached to the cube, and realize that they must keep the same cube throughout the entire chamber.
Edgeless Safety Cube
The Edgeless Safety Cube was introduced in Portal 2, and is used only in Co-op gameplay, however it also appears once in the single player campaign as garbage. The "cube" is really a sphere. However, it still retains the coloring scheme and patterns present in the designs of the other cubes.
Discouragement Redirection Cube
The Discouragement Redirection Cube was introduced in Portal 2. Its main purpose is to redirect the Thermal Discouragement Beam (a deadly laser) to other places or through portals if necessary.
Frankenturret
Frankenturrets are bizarre Sentry Turret-Weighted Storage Cube hybrids created by Wheatley in order to complete test chambers when he had no test subjects. They are first introduced in Chapter 8: The Itch.
Frankenturrets do not speak, and instead emitting incomprehensible chirping sounds. They act as the Chapter's replacement for Storage Cubes, their only difference being that Frankenturrets will hop around aimlessly while not placed on a button. When picked up by Chell, they retract their legs inside their cubes. If they fall over on their sides or upside down, they will wave their legs trying to get up.
Weighted Storage Cube Receptacle
Weighted Storage Cube Receptacle is a receptacle for the Weighted Storage Cube, introduced in Portal 2. The Storage Cube must be placed securely inside the receptacle in order for the player to proceed. Although its appearance is similar to the Heavy Duty Super-Colliding Super Button, it cannot be activated by the player or any other object being placed upon it.
Edgeless Safety Cube Receptacle
The Edgeless Safety Cube Receptacle is a receptacle for the Edgeless Safety Cube, introduced in Portal 2. The Cube must be placed securely inside the receptacle in order for the player to proceed.
The Edgeless Safety Cube and its receptacle only appear as gameplay implements in Co-op mode.
