In Bigfoot Mt. at the beginningof the level you will see a house on a hill. In front of that house is a snowman. Shoot the snowman and eventually it will say you have unlocked Andre LaToilette.
In bigfoot mountain, achieve a perfect score.
In grave danger, fly into the graveyard and destory the baron's tombstone.
In X, achieve a perfect score.
In the beginning of Coyote Canyon on your right will be a town. In that town there will be a girl being hanged. Shoot her and it will say you've unlocked Cactus Rose.
In cave of boulders, achieve a perfect score.
In grave danger, achieve a perfect score.
At danger island when you get to the jungle go below the trees. You will see a giant snake wrapped around a tree branch near the end on the left side of the jungle, shoot it and you will unlock Island Jack.
In Coyote Canyon, achieve a perfect score.
In Bombsburg, achieve a perfect score.
In Thugsville, head to the harbor and shoot the union Jack flag on the ship under the bridge.
In Intestinal Track, achieve a perfect score.
On the last level in Adventure mode, X, beat Pilot X by destroying his robot. Pilot X will become a playable character in all modes except Adventure Mode.
In Monster isle, achieve a perfect score.
Go to monster isle. Shoot a ninja by the shrine in the middle of the jungle. If you did it right you will hear "you unlocked Sammy Wasabe".
In Thugsville, achieve a perfect score.
In the Cave of Blunders you start above a Arabian city. In the center of town there is a small area with pillars where Sheik is being bullied by a palace guard. Kill the guard to get Sheik Abdoul.
In Bandito attack, achieve a perfect score.
In Torpedo Run, achieve a perfect score.
Start a new game with ZENBU for the name.
Unlock Professor Gutenburg
Go into adventure mode and go to the torpedo run. Three subs will display on your radar. One of them is a yellow sub with the professor on it. Unlock the code by shooting two torpedoes at the yellow sub.
Unlock everything in the game to get this character.
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