Oh right, ten more, though I think you should do it one at a time to get them.
And Racing Trophies seem to be easier with the Giant Robot... Just use the second-to-last car and you'll blow the competition away. Don't have up held when you turn, just use the arrow keys. If you use space, you'll get a speed burst, but you can't turn, which could be useful at times, but...
What if the second to last car is not unlocked yet? And as I've been told, you only get racing trophies if you play as the first racer of Speed Inferno.
Well that's wrong, because I got my first Trophy as the second-to-last car. And it should be if you've finished so many races already...
Vehicles only get unlocked if you use the racer above them with the exception of the first and second since they're unlocked already.