Tyrian
   By:  Epic MegaGames
   Release date: 

   The codes.

   Type in these at the main menu screen.

 DESTRUCT      Play the built-in mini game. Press F1 for keys.
 ENEMY         Fly an enemy U-fighter.
 STEALTH       Fly a Ninja fighter
 STORMWIND     The elemental fighter weapon: sandstorm.
 TECHNO        The experimental fighter weapon: mine field.
 UNKNOWN       TX Silvercloud weapon: proton dispersal.
 WEIRD         Fly as a carrot food fighter armed with banana guns.
 5 CAR WAR     Get five vehicles each.
 HELI ASSAULT  Player two player's one weak copters.
 HELI DEFENSE  Player one player's two weak copters. 
 OUTGUNNED     Get five vehicles each.    
 TRADITIONAL   Two tanks.

   Use the following while in the game. Hold the keys all together.

 F2 F3 F6     Invincibility.
 F2 F6 F7     To skip to the next level.
 BACKSPACE 1  Turbo mode.
 G            Sets the difficulty level to impossible. Use an uppercase G.