In the mission before the ninja boss get a auto pistol and when the boss begins fire at the nninja and keep him at range, when you are out of ammo use the slide to kill him without to much trouble.
-On the bio research lab defeat Barabas and run down to the windows of the reception look left and right and see 2 gaps in the wall then pick up the stuff in the gaps.
- On the airport kill the strikers and instead of going into the airport run up the street and find a car on fire and a Hypo. Carry on running up the street and find a man who gives you a hypo.
- On Dr.Hasegawa's lab go to the bit where you kill the ninjas and go through the door on the right then in stead of following Shinatama, jump on the smokey glass
and look under the slope and find a energy cell.
Help out the scientists and other hostages and they thank you with usefull items.
Type in "canttouchthis": And you won't be knocked down for the whole game.
When fighting the final form of Muro, run circles around him! Then, when his sheild disappears, slide into him like mad. Just be careful when applying this tactic, because you have to change your direction frequently to keep him confused. Also, don't get between Muro and anything solid, as he will then pummel you to death. And, if you don't like the long wait for his invulnerability to go off, run just far enough so that he uses his those little tractor-beams. Avoid being sucked in, and his shield will deplete even faster. Be aware that there is no need to EVER go to the lower level of the arena! There are no pick-ups down there, and if Muro gets you with his beams, and he's still up on the higher part, he'll drop you to almost-death.
Type in "glassworld": and you will have glass furniture.
Type in "moonshadow": and you will be equipped with invisibility.
Type in "liveforever": And you cannot be killed for the entire game.
Type in "liveforever": and you will go the entire game without being killed.
Type in "carousel": and the game will play in slow motion
when you shapeshift (become other charcters with the cheat) try using the combos (ex. down then kick) with the main charcters like Muro, you can unlock awesome moves that you see the bosses use!
also there is a secret wepon that you can get with the munitions locker cheat, there is a invisible wepon near the big gun in the center and if you get it you shoot a red thing that slowly homes in on a target. very cool.
Type in "touchofdeath" : and one one hit kills all.
Type in "killmequick": and you will have tougher enemies.
Type in "superammo": and you will have infinate ammo.