Cheat mode
Pause the game, then hold L2 and press Triangle, Circle, Triangle, Circle(2), Triangle, Left, Circle, Up, Down, Right, Circle, Left(2), Triangle, Right, Circle, Left(2), Triangle, Circle, Down, Circle(2), Right. For the PAL version of the game, hold L2 and press Left, Up, Square, Triangle, Right, Circle, Up, Square while playing a game. Then, pause the game and repeatedly press Down to access a cheat option with infinite health, all weapons, level skip and infinite money selections.

Defeating Tyrannosaurus Wrecks (form 1)
Wait for him to stand still so you can run up his back and stab his brain. Repeat this twice.

Defeating Tyrannosaurus Wrecks (form 2)
Wait for him to stand still and shoot his brain. Repeat this three times.

Defeating Mecha-Elephants
Run under them and shoot the Imp in the driver seat. You should be able to shoot them three times.

Defeating Mega-Elephant
Simply hit the switches when the robot is under the magnets. Repeat this three times.

Defeating Dogman and Mander
First, defeat Dogman by running hits with the hammer, then use the pistol or the crossbow on Mander.

Defeating Dogman and Mander (round 2)
This fight will be easier if you have the magic sword and flaming crossbow. Use the magic sword on Dogman and the flaming crossbow on Mander.

Defeating Iron Slugger
The best attack to use on him is the Jawbreaker (hold R2 + Square). If you lose at least two limbs, than wait for the round to end to get your limbs back.

Defeating The Count (form 1)
When he stands in the middle of the room, hit the closest mirror around until it faces him. Then, let him fire the white balls at the mirror. Repeat this four times.

Defeating The Count (form 2)
While avoiding him, hit the mirrors again until sunlight pours in. Repeat this twice.

Defeating Jack The Ripper
Avoid him until he attacks Kia. If she is harmed, then use good lighting on her.

Defeating The Demon
Instead of attacking The Demon, attack Palethorne. To defeat him, use the gatlin gun on his engines when he is flying past. Watch out for the missiles that he fires. Repeat this four times.