Instructions
Press "Start" on the Time Trial racing mode and race a ghost on any track. The ghost you race against will travel straight forward down the track and won't veer off road at all.
Stay about four seconds ahead of the ghost and do not fall off the track.
Pass the finish line between four to seven seconds ahead of the ghost. If you made it in time, you will see the words "A Fast Staff Ghost Has Appeared." Go back to the time trial page and the new ghost will be available to race. It will run much faster than the Time Trial ghost and take extra short cuts.