Taz Wanted Level select:
Select the Marvin Martian icon at the start game screen, then enter #OP as a code.

All art gallery:
Select the Tweety icon at the start game screen, then enter .RT as a code.

All mini-games:
Select the Daffy Duck icon at the start game screen, then enter ?BN as a code to unlock all the mini-games.

No whack in boxes:
Select the Taz icon at the start game screen, then enter !WB as a code.

Two player Boss games:
Select the Big Red icon at the start game screen, then enter *JC as a code.

Unlock Galleries:
Art Gallery 01 - Collect $ 10,000
Art Gallery 02 - Collect $ 30,000
Art Gallery 03 - Collect $ 60,000
Art Gallery 04 - Collect $ 110,000
Art Gallery 05 - Collect $ 185,000
Art Gallery 06 - Collect $ 285,000
Art Gallery 07 - Collect $ 535,000
Art Gallery 08 - Collect $ 1,035,000
Art Gallery 09 - Collect $ 1,785,000
Art Gallery 10 - Collect $ 2,785,000