Portal

Cheat List:
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All commands are done via the console. They must be enabled via the console option 
on shortcut, or enabled through the in-game options under the Advanced section of 
Controls. It is then accessed by pressing ~. 
(Note: Most of these require sv_cheats to be set to 1.)

Result                                          Code
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Allow separate sets of portals to be created  - change_portalgun_linkage_id <0-3>
Spawn Weighted Storage Cube                   - ent_create_portal_weight_box
Fire an energy ball                           - fire_energy_ball
Portal placement cannot be bumped             - sv_portal_placement_never_bump 1
Portals can be placed on almost any surface   - sv_portal_placement_never_fail 1
Allow use of second portal placement          - upgrade_portalgun

Overheating Xbox 360:
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Play the level where you face off with the laser guided robots. Once you get past 
the first few robots, you must start dropping the boxes on the robots heads so that 
they fall over. In the little place that you find the first two boxes, crouch and 
walk behind where the boxes were. You will find a little room with odd music playing 
and graffiti on the walls that says things such as "The cake is a liar". There also 
seems to be an Xbox 360 with a pot inside of it. The Xbox 360 is overheating and 
boiling the water.

Box head pictures: 
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On the level where you get the companion cube after you run past the energy balls 
and are in the room with the three elevators, there are two doors leading to a 
catcher, and a platform that is pushed out of the wall. Walk up to the platform 
that is pushed out. Crouch behind it and walk through the opening. On the left hand 
side are a group of pictures of people with boxes for heads and hearts around them.

Alternate title screen:
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Successfully complete the game to see the cake title screen.