Type these in at the main menu screen for super powered ships.
STORMWIND
TECHNO
UNKNOWN
ENEMY
WEIRD
STEALTH
DESTRUCT
Impossible Mode - When you select the difficulty type G (capital) and a new difficulty level will appear.
Hidden Sub-Game - To enter the Scorched Earth style game, simply type destruct at the main menu. Keys for play can be obtained by pressing F1.
F2, F3 and F6 at the same time to become invulnrable.
In your dos prompt select the directory which tyrian is currently in and type File0001 then a space and one command line parimater: Loot alt 254 (press and hold Alt button then the on the numeric pad press and hold 2 5 and 4 in that order. Some times you mess up and get some other character but keep tyring and it will work) This gives you in the "full game" 1,000,000 credits. Yesxmas enables Christmas mode when it is not Christmas (Cristmas mode is avalible only on v. 2.1 or 2.0)