When you are in the kitchen there will be a mousetrap. Touch but don't move while you are in the air. If you have a napalm shoot it at the kids butt. He will fart when you shoot his butt. Then go back down and enter a place where the kid is. You will find Darkside inside, get him and you will unlock Darkside. You could only do this in one-player tournament
AXEL: One player tournament mode. in playground peril Face the swings and shoot a missile at the middle swing then you should see a figure of axel on the ground pick it up now you have axel
DARKSIDE: one player tournament. in easy death oven get on the middle Island or counter in the center,face the plumber drive off and shoot a napalm or power missile, the plumber will fart and blow a hole in the middle counter and you will see the figure of darkside
PIECEMEAL: to get piecemeal beat the game on hard with Trapper
Axel: In Playground peril shoot the middle swing in the background. A little figure of axel should fall onto the field. Collect it and you have Axel. Only in one player tournament.
Darkside: In Easy Death Oven, should a napalm and the kid's butt. He should fart and blow a hole in the wall. Enter the hole and pick up the figure of Darkside. You now have Darkside as a playable character. Only in one player tournament.
Holiday Havoc Level: Kill thirty guys in an endurance match.
Mime: Go to the Holiday Havoc Level. Destroy the christmas tree then get on top of the fireplace. go backwards until you fall off the edge. Shoot all four stockings to find a little picture of Mime. Get it and you unlocked Mime