This article is from the Final-Fantasy and other Square Soft Games FAQ, by email@example.com (Nick Zitzmann) with numerous contributions by others.
Because World Runner is almost exactly the same as Highway Star/Rad
Racer in terms of the game engine, the "continue" trick from that game
also works in World Runner.
In other words, if you get the dreaded Game Over, hold down the A button
while pressing Start. You'll continue the same stage.