OH, man, David greenwood is so gonna hate me for this. xd! i'm gonna tell you how to go through the game "shades of doom" from lv1, to lv9. even how to beat the bosses.
Level one is easy. You just have to walk through the halls, shoot the monsters, go into some rooms, destroy the aqueptment, and get the "security chip." or a balm. xd! both will work, but i sujest the sucurity chip. once you get to a locked door, if you're not already using it, switch to your gun. as soon as you open the door, fire. if the monster is firing and shooting you, close the door, switch to gernades and open the door. Quickly throw one in, and close the door. in like 2-3 seconds, the monster will be dead. Go inside, to your left is a elivater that leades up to level 2. take the monsters gun, bullits, and anything elts he hhas. go to the elevater, go to next levil. (must pay for the game to do that.) Once on level 2, you will see new monsters. I personally, keep the semyaudimatic gun out on this level. you will inter a room, first monster you will see is a "syborg" shoot it before it hits you. thank god, they don't have guns just yet. keep going through the halls. just so you don't get lost, hit control v to set a marker so you know that you've been there before. once you find a gass jet, do not go near the right wall, it will burn you to a crisp. instead, go to the left, slide along the wall find the door, and if you couldn't find the right sucurity chip, and you have a balm, blow the door off. again, i wouldn't do that. once inside, you will find a locked elevader. and a locked crate. unlock the creat, open it, and run for your life. once you are like 72 yards away, turn around, aim your gun, and shoot the crap out of the monster. get the chip, and unlock the elevater. go to level 3. it's easy. just turn only right. they added quite a few locked dooors so, you might get confused at first. save your balms. after you get through the levil, unlock the elevater and go up to lv4. you will get......the chainsaw on lv3, and ii think a flame thrower on lv 4. go through that one, lv5, gives you a audomatic gun. but, if you hear something like a machine turning. either, a. you're doomed. or b. you know how to aim fast. it's a machine, yes. but somehow, it's alive, and a monster. You will hate those suckers. you will see them alot. lv6, alittle tricky, but you get a "bio disrupter" on that levil. and meet a new monster for the first time. called a "temperal disturbance." or otherwords "a royal pain" xd! if you can get the stuff without having to shoot it, do. but if you have to, shoot it down. it takes like...394 bullits to get rid of those suckers. unlock elevater, go to lv 7. now it gets tricky. how do you know when your at the elevater door? it electracutes you. you can unlock it, but it will still electricute you. use a balm and blow the door off its henges. walk through, then go to lv8. oh, and you should pick up a "trancport pad" on lv 7. if you don't, well, i fill sorry for ya. by lv 8 you have: bear fists, long knife, manual bolt gun, simmieaudomatic bolt gun, audomatic bolt gun, chainsaw, bio disrupter, flaimthrower, and lazer pistel. along with gernades. (can't spell it.) once through lv 8, bang. you are at the boss's levil. all i can say, have alot of amo, or you die. their is: 5 giant rats, 4 mutent burds, some mutent humans, can't remember how many, and lets see....4 syborgs. one silent walker. one galatenous blob. i think that's all of 'm. Make sure you have like 9-10-12 med kits. this is the most chalanging levil. if you manage to servive, their is 4 bosses, but they can use their transport pads and go anywhere on that levil also. There is one temperal disturbance on that leval, shoot it to the grownd and then go after the bosses. use the lazor pistle on the bosses, proximently 4 shots each, and they all die. the temperal disturbance, take into the passage where you hopefuly killed all the monsters! and corner it in a dead end passage. then just use the audiomatic bolt gun until you hear bullits bouncint off the wall, but the thing can move. so just in case, hit the d key and check your souroundings. if it shows up, hit s and turn the night scope on. locate it and shoot. the night scope, save as much as you can of the battery juse. it is needed for lv9.