Select the Marvin Martian icon at the start game screen, then enter "#OP" as a code to unlock all levels.
Select the Daffy Duck icon at the start game screen, then enter "?BN" as a code to unlock all the mini-games.
Select the Big Red icon at the start game screen, then enter "*JC" as a code to unlock the two player Boss games.
Select the Tweety icon at the start game screen, then enter ".RT" as a code to unlock all art galleries.
Select the Taz icon at the start game screen, then enter "!WB" as a code.
Collect all 100 sandwiches in a level to unlock a mini-game at the main hub. Use the blue phone booth with a propeller in front of the level with the completed sandwich to access its mini-game.
When you have collected all the contraptions in Yosemite Zoo, you will enter the Elephant Pong mini-game. Press Circle to Pong (scare) the elephant. The elephant will get faster each time you do this and scare Gossamer. Get three goals to win.
Wait until his shield is shut down. Then, gobble up a crate and hit him. Do this three times. Next, gobble up a crate until the white cylinder is up. Spit all four cylinders until their color turns red. Avoid his attacks so you do not die. Finally, gobble up a crate and hit all the levers so Tweety can be sucked out.
At Disco Volcano, jump all the way to the middle and get the chili pepper. Sam will be ready to blow up the dynamite. Without falling down to the lava, breath fire at Sam. If you fall into the lava by missing the platform, you have to try again.
Push Daffy to the tunnels that have up arrows all around in the tunnel to the left. There is a spring leading to one goal. Daffy would be trapped by going up and down if he finds the other path. You will have time to win the game.