This was such a waste.
You absolutely have to set the controls to the DPAD to win a race. Which ruins the whole point in having a DS. This is rediculous.
This is a waste of money. and you will never beat it using the touchscreen.
So unless you are extremely good at finger acrobatics and believe that you can steer a car while stretching your hand across the DS while holding the accellerator and the DS at the same time.. Go for it.