Wild Wild Racing
Hold Square and press Up, Circle, Down, Circle, Left, Right, Left, Right, Circle at the options screen . A new window titled "Secret" should appear at the bottom of the options screen to confirm correct code entry. Go to single player mode and enter your name as NORTHEND. This will unlock all courses, cars and the ice cream van and cow catcher (UFO).
Press X to accelerate when "1" appears during the pre-race countdown.
Successfully complete the game in time attack mode to unlock a better engine.