Characters...
	Tracks...
	Turbo Boost at start of race...

Spent SEGA Miles to unlock following characters.

Unlockable	How to unlock
Alex Kidd	80,000 SEGA Miles.
B.D. Joe	80,000 SEGA Miles.
Beat	60,000 SEGA Miles.
Big the Cat	40,000 SEGA Miles.
Chuih	100,000 SEGA Miles.
Jacky Bryant	60,000 SEGA Miles.
Knuckles the Echidna	40,000 SEGA Miles.
Mobo	100,000 SEGA Miles.
Opa-Opa	100,000 SEGA Miles.
Ryo Hazuki	80,000 SEGA Miles.
Ulala	60,000 SEGA Miles.
Zobio	40,000 SEGA Miles.

Spent SEGA Miles to unlock following tracks.

Track	How to unlock
Bingo Party	30,000 SEGA Miles.
Dark Arsenal	30,000 SEGA Miles.
Deadly Route	80,000 SEGA Miles.
Highway Zero	90,000 SEGA Miles.
Jump Parade	60,000 SEGA Miles.
Lava Lair	60,000 SEGA Miles.
Lost Palace	10,000 SEGA Miles.
Monkey Target	50,000 SEGA Miles.
Ocean Ruin	20,000 SEGA Miles.
Pinball Highway	20,000 SEGA Miles.
Rampart Road	50,000 SEGA Miles.
Rokkaku Hill	80,000 SEGA Miles.
Sandy Drifts	40,000 SEGA Miles.
Sewer Scrapes	70,000 SEGA Miles.
Sun Fair	70,000 SEGA Miles.
Thunder Deck	40,000 SEGA Miles.

For a quick turbo boost at the start of a race, wait until just after the number two in the countdown disappears, then hold A. If done right, you will receive a turbo boost as soon as the race starts.