zombie mode

Since you didn't provide a lot of details, I may be telling you stuff you already know. There are pictures of weapons drawn on the wall and if you stand in front of them you will be prompted to hold the square button to purchase them. There are 4 weapons to choose from on the walls. One is bolt action rifle, another is a single-fire semi-automatic, a double-barreled shotgun and the mp40 Thompson. The shotty and the mp40 are in the room where you unlock the Help door. Don't unlock that door unil you have enough money to purchase an upgraded weapon because you also unlock 2 more breach points. Don't waste your money or time with the shotty as it is too slow to reload to be effective. You only get 2 shots at a time before reloading and you can't reload while you are running so there's no point in having it.

There is also a random weapon box in the Help room that can be usefull. The least useful weapon I got so far was a scoped sniper rifle - kinda useless in a small room so I was no-scoping with it. Needless to say, I died pretty quick after that. You probably also noticed that there are random pickups when you kill a zombie. The pickups I've seen are max ammo (not to be confused with unlimited ammo), 2x points, nuclear bomb (kills all zombies in the level), and insta-kil for 30 seconds. I'm sure there are more pickups but I've only been able to get to level 6 myself so far.

As Homin8r said, but I dis-agree with the shotgun. In the later levels, the D-B-S comes in very handy, and you can't reload ANY weapon while sprinting. As well as the second door, you can unlock upstairs too and get a Scoped Kar98K (it's in a cabinet), a Trench gun and a BAR. The most usless weapon by far in the un-scoper Springfield. The most useful would, without a doubt, be the Ray-Gun.
If you want to make it to higher levels, use the glitches on the User-Submitted Hints page.
For these, the Flame-Thrower is by far the more suitable gun.
I suggest that you fire in short bursts, rather than a long, continous jet of Flame.

Well for more points if you get a headshot it's 100 points and it helps a lot to get mroe points. For the weapons, they are on the walls and you can unlock different parts of the building to get more weapons. There is a "random box" which has some really good weapons that can be helpsful like the ray gun and the M2 Flamethrower.

Sorry for the typos

AS THE OTHERS SAID THE RAY GUN,D-B-S, AND THE M2 ARE BEST.THEY SAY ITS A CHALLENGE WHEN YOU PLAY ONLINE AND YOU CAN GAIN XP FROM IT IF YOU BEAT IT BUT I REACHED LVL 15 MYSELF AND IT STILL KEPT GOING ON.(I HAD FRIENDS TO HELP OTHER WISE I WOULD OF LOST ON LIKE 5 OR 6.RANDOM BOX HELPS ALOT FOR YOU GUYS I GUESS BUT NOT ME.ALSO CRAZY CHEATS HAS THE RIGHT IDEA ABOUT THE GLITCHES.GOOD LUCK.

Dude, stop shouting. In forums, that sort of thing would get you banned. God they're letting EVERYTHING go through in back, aren't they?

The best gun that you probably can use is Thompson it's is the best gun in the game and the most versatile.

If your in the first room wait until you get 2000 or over you can unlock the help door and a gun but if you get not a very good gun then just retry it but if you have a good gun get a double barrel shotgun or a shotgun it's better to have a friend with you or go online I can only get to round 15 online but I'm not a call of duty fan I only like zombies try these games:MAG FLASH POINT ARMORY2 DAY Z you can die really easily there's a glitch were you can go out of the place and weapons are on the floor outside and there free but I forgot how you do it you can add me on the ps3 I'm called jakephlosion