Need For Speed: Nitro (Wii)
Get ten stars in Career mode.
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Start with two bars of nitro
At the start of a race, fill your nitro bar by having the dial on the green bar on your speed meter. As soon as the race starts, hit the nitro and release the gas. You should now have both bars filled. Note: You will need to have filled the first bar before the race starts or you will not be able to get the second bar filled.