Wipeout 2097/XL (Psygnosis)

At the title screen type:

RUSH

Gives silly(er) ships

At the main menu type:

XTEAM

Enable Piranha team

XCLASS

Enable Phantom class

XTRACK

All tracks

You may also pause the game during a race and type:

PSYMEGA

Infinite weapons

PSYPROTECT

Infinite energy

PSYTICKER

Infinite time

PSYRAPID

Machine gun

FRAMERATE

Display frame rate