Pause game play, select "Extras", then "Cheats", then "Add Cheat". Activate the following cheats by entering the corresponding codes.. A sound will confirm correct code entry. Note: You must manually save the game while cheats are enabled.
1. By default this code has no effect and has a special condition to become unlocked.
Take any customizable vehicle into Rim Jobs and hit Y, then go to Garage in the menu and highlight a vehicle that isn't customizable from your list. Instead of clicking the button to retrieve it, hit B to back out of the menu and then click accept to confirm the exit. Now it will take you directly to the customizing menu.
Go to Brickston and get to the bridge that leads east out of that neighborhood. Locate the cave next to the water just north of the bridge. The Penetrator is hidden inside the cave. You need super-powers to jump inside.
Pause the game, select the "Extras" option, then select the "Cheats" selection. Select "Add Cheat" then activate the following cheats by entering the corresponding codes. A sound will confirm correct code entry. Note: Trophies and auto save are disabled when cheats are activated. However, you are still allowed to manually save while cheats are enabled:
In the "Breaking The Law" mission you receive the Pyro elemental, a reference to Beavis And Butthead. Beavis was a pyromaniac who used to say "Fire Fire" while watching things burn, and "Breaking the law, breaking the law".
Chronicles Of Riddick easter egg
After killing Zinyak, Kinzie remarks that "You keep what you kill" is a classic. This is a reference to Chronicles Of Riddick, when Riddick killed the emperor who slaughtered his people.
Dead Island easter egg
One of Keith David's dialogue lines is "I was twelve hours into Dead Island now i'll never finish it. I can't forgive Zinyak for that".
The Hitchhikers Guide To The Galaxy easter egg
The "Don't Panic" achievement or trophy is unlocked when the earth is blown up by Zinyak, a reference to the words "Don't Panic" written on the Hitchhikers Guide To The Galaxy's book cover, in which Earth is blown up by an alien race.
Mass Effect 3 easter eggs
Besides the "romance skipping straight to sex" as a jab at Mass Effect 3's Romance system, during the Zin attack on the White House the Reaper laser sound effect can be heard.
Metal Gear Solid series easter eggs
You are supposed to sneak through one of the levels by shooting light bulbs, then the guards under them. When the light bulbs are shot, the guards get "WTF" over their heads, like the exclamation point in the Metal Gear Solid series. You can also sneak under a box and fight an evil twin, which all occurred in Metal Gear Solid.
Saints Row series easter eggs
The simulation "Leave It To The Saints" is a parody of Leave It To Beaver. One of the things the mother says is "Someone named Dex was here asking for you but I didn't recognize him so I sent him away." This is a reference to Dex, a former member of the Saints who turned security for Ultor turned terrorist in the Saints Row 2 DLC. He was planned to appear in Saints Row The Third but what left out because "Newcomers to the series wouldn't recognize the character and they didn't want to alienate them".
Kinzi remarks that Keith David's voice is similar to Julius. Keith David provided the voice for himself and Julius Little.
Streets Of Rage easter egg
During a level you play a side-scroller called "Saints of Rage".
Weapon easter eggs Almost every weapon customization is a pop culture reference. For example:
The Captains pistol is from Firefly. Its plating form uses Shiny, which was a term for "good" on Firefly.
There is a phaser that jokes about Star Trek's redshirts saying "Aliens never attack red", which was the opposite occurrence on Star Trek.
Above the phaser is Han Solo's blaster, with a reference to the "Han shot first" meme.
Minecraft easter egg
During a Security Deletion mission, the selected target you have to kill is a Minecraft character.
Space Invaders easter egg
At the start of the game when the president uses the gun turret to destroy alien ships, the alien ships will line up just like in the Space Invaders game.
Tron easter egg
During a Virus Collection mission you must retrieve a bike. If you look closely at the bike, you will see it is the bike from the Tron movies.
The Matrix easter eggs
During the "Zero Cool" main story mission, Zinyak will explain how your race is doomed and will force you to pick a door; a reference to The Matrix: Reloaded, when Neo meets the architect of The Matrix.
When you first meet The Warden, you must defeat him by jumping into him and absorb him. This is a reference to when Neo jumps into Agent Smith and absorbs him in The Matrix.
Terminator easter egg
During the "Ghost In The Machine" main story mission, you will come across the "murder bots" (you will also encounter this enemy throughout the game). They look exactly like the Terminator, and their weapons sound the same as the Terminator's weapons.
They Live easter egg
Play the Keith David's Loyalty mission "He Lives" until Roddy Piper tries beatingsense into Keith David who is panicking about an alien invasion. Female Voice 2 (if not all of them) says "Put on the glasses Keith, we're not aliens", a reference to They Live in which Roddy Piper tries to force Keith David to put on a pair of glasses that reveal aliens who are disguised as humans.
Go to the rear of the Let's Pretend store in New Baranec (southwest Steelport) and shoot the "Employees Only" door until it opens. Go down the hallways and stairs to reach a secret room containing a colorful shooting gallery with images of the developers. Shoot their heads to have them explode into fireworks and go into the bathroom to see a blowup doll sitting on the toilet. There is also a special weapon on the chair to the right of the entrance door called the Loud Locust, a reference to the Noisy Cricket from the Men In Black movie. Shoot the weapon to be sent flying backwards just like in the movie.