Unlock All Circuit Tracks
Press Down, R, R, R, Black, Black, Black, X at the main menu to unlock all circuit tracks.
0% success rate. 

Unlock All Drag Tracks
Press Right, X, Left, R, X, L, White, Black at the main menu to unlock all drag tracks.

Unlock All Drift Tracks
Press Right, Right, Right, Right, Left, Black, R, White at the main menu to unlock all drift tracks.

Unlock All Sprint Tracks
Press Up, Black, Black, Black, R, Down, Down, Down at the main menu to unlock all sprint tracks.

Drift Physics
Press R, Up, Up, Up, Down, Down, Down, L at the main menu to unlock drift physics for all cars.

Go to: Need for Speed: Underground Info Page | nGaming Home Page.