Some of these hacks require Half-Life 2. Most require the Developer Console and cheats to be enabled. To enable the Developer Console, check "Enable Developer Console" in keyboard options. To enable cheats, open the Developer Console using the tilde (~) key, type sv_cheats 1 and hit enter.
Play With Weapons
Open the Developer Console and type impulse 101. Use the number keys to switch weapons (1 is portal gun) and mouse button to fire. When you select a weapon, a note about its use appears.
Become Invincible
Open the Console and type god or buddha. Also, notarget makes you invisible to turrets.
Upgrade Portal Gun
Type sv_portal_placement_never_fail 1 at the Console to place portals on any surface.
Also, type upgrade_portalgun to get the next level portal gun (None->Blue->BlueOrange)
Change Your View
Type thirdperson to see yourself in third person. Type firstperson to get back.
Create Stuff Out Of Nowhere
Aim where you want to place an object and type the following things at the console to spawn objects:
Bouncy Metal Sphere - ent_create_portal_metal_sphere
Turret Buddy - npc_create npc_portal_turret_floor
Weighted Storage Cube - ent_create_portal_weight_box
High-Energy Pellet - fire_energy_ball
