Portal

Portal cheat codes: 
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.)
change_portalgun_linkage_id [0-3]  - Allow separate sets of portals be created
ent_create_portal_weight_box       - Spawn Weighted Storage Cube
fire_energy_ball                   - Fire an energy ball
sv_portal_placement_never_bump 1   - Portal placement cannot be bumped
sv_portal_placement_never_fail 1   - Portals can be placed on any surfaces
upgrade_portalgun                  - Allow use of second portal placement
npc_create npc_citizen             - Spawn citizen
npc_create npc_breen               - Spawn Breen
npc_create npc_zombie              - Spawn zombie
ent_create_portal_metal_sphere     - Spawn Bouncy metal ball
give weapon_portalgun              - Basic portal gun
view firstperson                   - First person
view thirdperson                   - Third person
impulse 101                        - All weapons, including from Half-Life 2
god                                - Invincibility
noclip                             - No clipping mode
sv_cheats 0                        - Disable cheat mode
sv_bonus_map_complete 1            - All challenges completed
buddha                             - Take damage but cannot die
sv_gravity [number]                - Set gravity; "600" is default
npc_create npc_headcrab            - Spawn live Headcrab
npc_create npc_barnacle            - Spawn Barnacle
npc_create npc_combine_s           - Spawn Combine Soldier
npc_create npc_gman                - Spawn Gman with suitcase
npc_create npc_alyx                - Spawn Alyx
npc_portal_turret_floor            - Spawn standing turret
npc_create npc_metropolice         - Spawn Metro policeman
host_timescale [number]            - Set game speed; default is "1"
notarget                           - Turrets do not shoot at you
npc_create_aimed npc_rocket_turret - Spawn a rocket turret
ch_createairboat                   - Spawn an airboat
ent_fire npc_rocket_turret toggle  - Toggle rocket turrets
ent_fire !picker skin 1            - Turn targeted storage cube into companion
npc_create npc_fastzombie          - Spawn Half-Life 2 "fastzombie"
npc_create npc_poisonzombie        - Spawn zombie that tosses Poison Headcrabs