Increase your typing speed while racing against others

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I like the concept a lot. Some car racing/track sounds would be fun additions :) But two things really bug me about this. 1) The web page makes me feel like I'm about to download a virus 2) I hate hate hate it when typing instructors make me stop, go back, and fix my mistake. Just log it and let me continue. Or at least stop the cursor so I don't have to completely snap out of it, figure out how far to go back, etc.