Unlock 100 Gems:
At the 'Mode' menu press L + R and enter the code V1S10NS to unlock 100 Gems to help you purchase the full set of collector cards. This code can only be used once in each saved game.

Unlock Orange Game:
At the 'Mode' menu press L + R and enter the code SP4RX.

Unlock Purple Game:
At the 'Mode' menu press L + R and enter the code P0RT4L.

Unlock Orange Spyro:
At the 'Mode' menu press L + R and enter the code SPYR0.

Unlock Sheep Enemies:
At the 'Mode' menu press L + R and enter the code SH33P.

Unlock Flying Sheep instead of Flame:
At the 'Mode' menu press L + R and enter the code B41S0KV.

Unlock Alternate Credits:
Complete Story mode and then select 'Credits' from the 'Main' menu.

Unlock Crash Party USA Mini-Game:
Hold L + R and turn on the Game Boy Advance.