The following courses can be unlocked by spending the indicated amount of money.

Rampart Road (Billy Hatcher): $5,000
Dark Arsenal (Sonic The Hedgehog): $5,500
Pinball Highway (Sonic The Hedgehog): $6,500
Sewer Scrapes (House Of The Dead): $7,000
Lost Palace (Sonic The Hedgehog): $7,500
Sandy Drifts (Super Monkey Ball): $8,000
Rokkaku Hill (Jet Set Radio Future): $8,500
Rocky-Coaster (Samba de Amigo): $9,000
Highway Zero (Jet Set Radio Future): $9,500
Deadly Route (House Of The Dead): $10,000
Ocean Ruin (Sonic The Hedgehog): $10,500
Bingo Party (Sonic The Hedgehog): $11,000
Lava Lair (Billy Hatcher): $11,500
Monkey Target (Super Monkey Ball): $12,000
Thunder Deck (Sonic The Hedgehog): $12,500