Mashed Cheats

Master code:
Press Up, Right, Down, Left, Up, Left, Down, Right, Up, Down, Up, Down at the main menu to unlock all options at the "Bonus Features" menu.

Quick start:
Press A on the on the fourth beep during the pre-race countdown.

Camera options:
By winning every Challenge Cup event to unlock the "Flipped-cam", "Mashed-cam", "Oz-cam", and "Retro-cam" options at the "Bonus Features" menu.
User Cheat by ShockJock

Mashed Official Website

Mashed Review - 3D Avenue

Mashed Review - EuroGamer