Big Red Racing

Hidden Tracks:

U.S.A.: Use the boat with the big propeller.
Go off-road to the left.
Some of the hills are tough to get up, but at some parts of the track, the hills are very small.
If you get up you'll find many awesome jumps, a few gorges, and a lot of ways to get flipped over.

Japan: Use any vehicle. Go off road to the left again.
Or if it's too much trouble, at the first "Gate jump", follow the water to the left.
You'll find a "Gate jump" surrounded in slippery water.
To top it off, the track's surrounded by incredible jumps. (Information from Cheat Machine)