Compete all bonus missions to access Spanky as a hidden pilot.
Fly enemy planes in deathmatch mode

A new enemy plane will become available in deathmatch mode for each level completed in the game. A total of six enemy planes may be enabled.
Alternate plane color

At the plane selection screen, press R, in main game practice or boss attack modes. For death match mode, hold R while selecting one of the four default planes.
Unlimited continues

Before reaching one credit remaining, reset the game and continue from the menu that immediately follows the title screen. Then the game will resume with the same number of credits that were available when the current stage was started.

Go to the ant hill from the main screen. Then, hold C-Up + C-Down + C-Left + C-Right + Z and press R. If you entered the code correctly, an arrow will appear at the bottom of the screen.
Invincibility

When the level description appears at the start of a level, hold Z + R + L. Note: The invincibility only lasts for the current level.

Minimum System Requirements
OS: Windows XP SP3/Vista SP1/Windows 7
Processor: Intel Core 2 DUO @ 1.6 GHz
Memory: 1 GB
Hard Drive: 6 GB Free
Video Memory: 512 MB (NVIDIA GeForce 7800 GT/ATI Radeon X1800)
Sound Card: DirectX Compatible
DirectX: 9.0c
Keyboard & Mouse

Need for Speed: SHIFT System Requirements

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Pokemon Ruby Cheat Codes:  Game Boy Advance Cheats

2 Glasses, Pencil, Mouth
3 Soap bell, Mouth, Glasses
4 Shy, Chief, Glasses

The Smurfs Nightmare for Game Boy Cheat Codes.

Unlock Army Version
Go to Extras then to Cheats Input and put in the code: HA2P1PY9TUR5TLE
civilians are more aggressive to the US soldiers. More aggressive terrorists.

Unlock Unlimited Ammo (For Mercenaries?) Makes the game tougher
Go to Extras then to Cheats Input and put in the code: MERCENARIES

Unlock Real Damage Mode
Go to Extras then to Cheats Input and put in the code: SWEDISHARMY

Durability – Must get Durability Attribute score of 85.
Exploder Tunbuckle Attack – Must get your speed attribute score of 75.
Fan Favorite – Must get charisma score of 80.
Fired Up – Must get your overall rating of a 90.
Hardcore Ressurrection – Must get hardcore score of 90.
Kip Up – Must get a Technical score of 85.
Lock Pick – Must get a submission score of 80.
Object Specialist – Must get a hardcore score of 70.
Resiliency – Must get an overall rating of 92.
Strong Strike – Must get a strike score of 75.

Enter “SESAME” as a player name.

99 Lives

Enter “BIGCATS” as a player name.

Invincibility

Enter “INFINITY” as a player name.

All Weapons

Enter “BIGGUNS” as a player name.

Cheat Codes Grand Theft Auto 2 for Dreamcast