Over the Hedge: Hammy Goes Nuts! (GBA)

Challenge Mode
Beat Story Mode.

Unlock Backyard Cup
Finish "FANtastic" in the Story Mode and then buy for 210 nuts.

Unlock Penny
Finish level "Try, Try Again" of the Story Mode, and then buy her for 140 nuts.

Unlock Sound Test
Finish the "Ozzie's Trek" level of the Story Mode.

Unlock Stella
Finish level "Depelter Turbo" of the Story Mode, and then buy her for 70 nuts.