Sonic's Secrets: Combat Cars.
On the options screen (see right), highlight "EXIT" then:
HOLD A + B + C (together) and press Start.
You will now have access to all the tracks in single player & 2 player team modes, you automatically have acess to all the tracks in Head to Head mode.
To select your track press:
Left + Right with a 3-Button Pad,
or X + Mode with a 6-Button Pad.