In the Nazi zombie game, either solo or co-op, you get 500 points displayed in the bottom right hand corner. 
These points can be used to purchase weapons, ammo and open/remove blockage to new rooms.
You start with only a not so good colt.45 pistol and 2 German stick grenades; you get 2 more each round, max 4.
You are in a room with 5 windows barricaded up with wooden boards. These are repairable. Now, when you spawn you 
are facing the first gun that is any good. The Kar 98k. This weapon is good in the earlier rounds but not so good 
in later ones. This bolt action rifle costs 200p, ammo is 100p.

The objective of the game is simple... DONT DIE! Zombies run at you, but are slowed down by the barricades. 
The zombies can get through by pulling the wooden boards off. You must shoot to kill before they get through. 
Broken windows can be fixed and you get 10p for a board, just stand by it and hold the X button. The biggest 
mistake players make is that you can still turn, aim and shoot whilst fixing windows. Killing the zombies is 
easy, you just stand at a window looking out, when you see a figure, shoot at it. You get 10p for a hit, 60p for
a one shot kill, and 100p for a head shot. In the first few levels, zombies walk at you and are easy to kill, but
later on they start running and sprinting. Another mistake players make is the m2 flame througher. It is a good
gun, but has a short range, quick overheat and is doesn’t kill them instantly, they burn and when you get to higher
levels they have more health.  

Basically kill before you are killed. I’m not sure if there’s an end to the game, but if you or you know somebody
 who has, tell cheatmasters.
Tips on the game...     I recommend these tips myself from my own experiences. 
To get better points for kills... try using your pistol and shoot the legs a few times, then using a better gun,
shoot its head off. Wait for them to get closer for better accurate shots. When a zombie is at a window wait a 
while for it to break a few boards, and then kill it and repair. Get 700p first, then by an m1a1 carbine in room 1.

To last longer...      only open the door in room 1 that has the word help scribbled on it, it has a Thompson,
double barrel shotgun, 2 windows, 1 wall that they can break and a mystery box (the reason for the room, costs 
950p to open, containing most of the weapons and a really cool ray gun, 1 shot kill but slow travel time) 
this is simple maths... the less windows the less flanking opportunities for the zombies who get more and
 more intelligent.Unlock the stairs in room 1, buy the trench gun and a BAR, sit in the corner where grenades are 
available, through them when there’s a load of them, when you run out just turn and buy some more, camp basicaly.