At the main menu type:

INEEDMORECARS   All cars

INEEDMOREMAPS   All tracks 

CHAMPIONSAVES   All classes

IMACHEATER      Press Ctrl + W to Win

GOKARTZ         Little wheels 

BIGHEADZ        Big driver heads 

BOXERZ          Big driver hands and feet 

BIGFOOTZ        Big Wheels 

FONEKART        Bonus track 

SPEEDRACER      Faster race 

MANONTHEMOON    Low gravity

GLUED           High gravity

TERRAFORMERS    Generate tracks 

GREASY          Slippery track 

In-game commands:

[Ctrl][H]       Clouds on/off 

[Ctrl][F]       Fog on/off 

[Ctrl][N]       Mirrors on the outside on/off 

[Ctrl][M]       Mirror on/off 

[Ctrl][I]       Interface on/off 

[Ctrl][J]       (+) Viewdistance 

[Ctrl][K]       (-) Viewdistance 

[Ctrl][Z]       FPS/ping 

[Ctrl][C]       Coords 

[Ctrl][T]       Different views of the map 

Thanks to Revolution readers Mason Beveridge, darren, Kaustubh Banerjee and

Youri van den Berg!