When you play siberia on hard or normal when you get to the west side of the dam and you get to the begi ning of the building on the shelf on the left there's a shelf and on the other side of it is the cartridge.
Stupid enemies shoot at ground ha ha your invenceable!
Added 10 Jul 2006, ID #6259
To do this first use either skyworld cheat. Now once in skyworld look up and shoot at the enemies your bullets shoot through the ground and hit them. The enemies shoot at the ground and it doesnt hurt you. Your invencebal! (also it destracts your enemise so on 2 player (or 3 or 4 player) and someone needs help shoot at them and they will start shooting the ground.
In another cheat it says you have to be on shrink mode right? Well what if you don't have shrink mode? Too hard to unlock? (for some people who think it's hard) well you can get in sky world without shrink mode actually you can do it on any mode.
In the training ground you know that ramp lookin rock that is above the little stone hut with a turret in it? Well go up the ramp and drop down on the to of it and positon yourself in the far corner you know where that barrel is below the hut?
Go to the first corner to the left abit and step to the edge and face in the direction of the big stone outpost thingy the tallest one with 2 floors anyway face that direction and have another human player as player 2 then have him shoot at you and when he/she shoots you, you should fall as your falling push the control sitck forward and hold it there you should see alot clouds Welcome to Skyworld!
Complete the levels in story mode to get the following characters.
hybrid mutant - siberia big tony - chicago jacque de la morte - notre dame ozor mox - planet x sadako - neo tokyo the colnel - wild west khallos - atom smasher stone golem - aztec ruins machinist - robot factory reaper splitter - space station
Get at least a silver to unlock these characters on challenge mode
Rotating heads (cheat) - pain in the neck brick (weapon)-bricking it the hunchback - stain removable sewer zombie - fight off the living dead sergio - sergios last stand feeder zombie - day of the dammed viking (hat) - silent but deadly pirate (hat) - trouble at the docks big ears (hat) - escape from neo tokyo private coal - gone bananas private poorly - monkey buisness wood golem - playing with fire ample sally - take 'em down marco the snitch - fall out sgt rock - pick yer piece badass cyborg - badass bus pass impasse r - one - oh - seven -but where do the batteries go the cropolite - hit me baby one morgue time insect mutant - simon shoot out mischeif - monkey mayham robofish - dam bursters when you complete all the challenges with a silver you will get - lola varuska , circus (level), paintball(cheat)