Make sure the Developer Console is enabled in options, and assign a proper key to open the console. Open the developer console in-game and note the following commands:
God - Makes you immortal (Your health is static) noclip - Ability to fly, even through walls (Type again to toggle) ent_create_portal_companion_cube - Creates a Companion Cube ent_create_portal_reflector_cube - Creates a Reflector Cube (For lasers)
These are just a few that I have tried and that work. Slight warning it will disable achievements and stats. Also remember to type sv_cheats 1 first.
"ent_create_portal_companion_cube" & "ent_create_portal_reflector_cube" don'tr need sv_cheats 1. Nor do any of the other "sv_" or "ent_" codes. These can still be used to get achievements.
using a swedish keybordsetup and cant get the console up, have tryed diffrent combos with the key`s and having no luck, is there anybody who can help me, coz the trainers dont work for me so thats why im trying the console codes..
Got it to work.. the problem was me.. havent done my reading.
havent done my reading. 
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