In adventure mode go to danger island. when you get to the jungle go below the trees. when you see a giant snake wrapped around a tree branch near the end on the left side of the jungle shoot it and you will get island jack
Unlock prof. gutetenburg
Go to adventure mode and go to torpedo run there will be three subs on yor radar one of them is a yellow sub with prof. gutenburg on the front shoot two torpedoes at it and you will unlock prof. gutenburg
Unlock Sheik Abdul
in the town area in the cave of blunders level, look down in a little arena like place and you'll see a guard trying to attack a townsperson. shoot the guard and you'll unlock sheik abdul.
Unlock the marcels moreso brothers
in the bombsburg level, before you reach the area where the machines are, look in the last few buildings on the left and you will find the marcels moreso brothers. run into them to unlock them.
Unlock Cactus Rose
in the coyote canyon level, look in the old western town at the beginning of the race. there is a carriage on the right side of the town ( the carriage where you complete the damsel in distress subgoal). shoot the carriage and you'll unlock cactus rose.
