Just watch. Press space for a speed boost. The number gauge is your speed in an arbitrary unit. Turbo Mode is recommended to reduce lag. Fullscreen improves graphics but increases lag. Not recommended.
Some player update has broken this completely. I got bored one day and made this. Its a fast scroller using the pen. Somewhat based of off RUN by DarkFusion: http://scratch.mit.edu/projects/1719274/ (it uses similar pen scripts). I also got the background soundtrack from RUN as well. The racecar is the Blue Falcon from F-Zero (SNES 1991), but recolored. ~TiberiumFusion~