Cheats & Easter Eggs
In Sonic The Hedgehog 3 & Knuckles, hitting Left, Left, Left, Right, Right, Right, Up, Up, Up while swinging on a vine, then pausing the game and hitting A will unlock this feature.
Sound Test/Level Select
Entering the letters "IDKFA" on the keyboard at any moment in this classic PC shooter gives the player maximum ammunition, armor, and level progression items.
DOOM (1993)
A B A C A B B
This cheat code's mere presence in this Sega Genesis port is partly responsible for the creation of the ESRB.
Mortal Kombat (1992)
↑ ↑ ↓ ↓ ← → ← → B A START
This NES arcade port serves as the official debut of the Konami code, and using it in-game gives the player a full set of power-ups, a debug feature left in the game by accident.
Gradius (1986)
Grand Theft Auto IV's Statue of Happiness resembles this politician as a nod to their involvement in the Grand Theft Auto San Andreas "Hot Coffee" controversy.
Hillary Clinton