At the options menu, select the "Cheat Codes" option, then enter one of the following codes to activate the corresponding cheat function. If you entered the code correctly, you will hear the sound of an engine.

All bonuses - Enter "YOUGOTIT" as a code to unlock all bonuses.
All challenges - Enter "MORESTUFF" as a code to unlock all challenges.
Freestyle tracks - Enter "ALLSTYLE" as a code to unlock Freestyle tracks.
All tracks - Enter "FREETICKET" as a code to unlock all tracks.
Paralyzer Monster Truck Enter "PWNAGE" as a code to unlock the Paralyzer Monster Truck.
All bikes - Enter "ONRAILS" as a code to unlock all bikes.
All riders - Enter "WHOSTHAT" as a code to unlock all riders.
50cc bike class - Enter "LITTLEGUY" as a code to unlock 50cc bike class.
All machines - Enter "MCREWHEELS" as a code to unlock all machines.
All gear - Enter "WELLDRESSED" as a code to unlock all gear.
1 million store points - Enter "MANYZEROS" as a code.

Easy store points - Go through single player Nationals, and earn the Mils Mesas environment or enough points to purchase it. After getting this map, exit the mode that you are in, and go to single player. Choose the custom event option, then go to "Nationals". Select the Mils Mesas track. Set the play mode to "Single Play", laps to "10", and number of opponents to "0". The MX superclass vehicle is recommended, but you can use an ATV or normal MX. Start the race, and do not worry about time or anything else. Just do as many tricks as possible. Try Dingo Backflips+ and 360+ for quick points. You can get about 700,000 score points and 350,000 store points.