Play as Spyro:
Beat the game with all Team Bandicoot characters.

Play as N. Tropy:
Beat the game with all Team Cortex characters.

Play as Velo:
Beat the game.

Velo track:
Beat Velo in Adventure mode.

Play as Geary:
Beat Geary at the Teknee track.

Play as Krunk:
Beat Krunk at the Terra track.

Play as Nash:
Beat Nash at the Barin track.

Play as Norm and Big Norm:
Beat them both at the Fenomena track.

Crash Party USA mini-game:
Repeatedly press L + R before the title screen appears.

Artillery cheat:
Beat the Blue Gem Cup in Adventure mode.

Lunar cheat:
Beat the Purple Gem Cup in Adventure mode.

R/C Kart cheat:
Beat the Green Gem Cup in Adventure mode.

Turbo cheat:
Beat the Red Gem Cup in Adventure mode.

Thanks to Revolution readers rufus 33 and Cheesy Poof!