NFS Underground is a racing game on www.flash-games.net .First, click the Start Game button and watch the stop light. When it turns green, use the buttons below to try and burn through the fastest 1/4 mile time you can. Space bar means gas, click up and down arrow keys to shift to lower and higher gear and N key means nitrous oxide burst. Experiment with starting RPM, shifting methods and nitrous bursts to improve your time. Use the nitrous wisely because there is a limited amount. When you’ve got a time you can be proud of, challenge a friend to try and beat it. Now take the streets. Have fun.