Portal Cheat Codes, on the PC

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