To unlock six hidden vehicles, hold the d-pad diagonal (Down-Right) and press L + R + C + Y at the title screen. Then press Start.

Enter the Time Attack code. When you finish a race and replay it, press L or R to change views.

The green car, pink car and horses are equally adept on grass and roads.

To see the Hidden message in the grass go to the Advanced track in Saturn or Arcade mode. After the checkpoint right after the tunnel there is a right turn,followed by the road going downhill. Right at the top of that hill,stop.Then if you start down slowly words will come into focus in the grass! Saying:SegaAm2SegaAm2!