stuck at Zombie Infection 2

[SpacePlefka]

I am at laboratory at the moment.
i was at a point where a zombie killed a woman and vanished.
instead of running after him or checking the area to the right, I went through the door which was on top of the screen. I entered a new area and wasnt able to go back. in that area I found a piece of paper with a code, just the first two numbers, 1 and 9. there are also metal boxes at one point which i cant move and a door which I cant open cause i dont have the full code.
I think I should have checked the other area completely first before going through that door...can anybody help me giving me the code or some other advice to continue, please?

[taikucingg]

The code is 9 1 2 0

[SpacePlefka]

Are you sure?
Are you talking about the laboratory or the mines? Im quite sure it started 19 and not 91.

[SpacePlefka]

Never mind, I totally missed one door. I found the other part of the paper
Thanks for trying to help tho

[taikucingg]

sorry if im mistaken because i finished the game long time ago
o yea you might want to reserve some ammo and medikits because you will fight 2 "lions"

[SpacePlefka]

Just killed them, now im on a helicopter

[mike1977]

then reserves a lot of medikit coz last boss (like an octopy) is painful....unless u activated the cheats GOD MODE....LOL..

[taikucingg]

o yea the flamethrower might get you mad because you have to collect all the weapon pieces and you can only use it for the chapter

[SpacePlefka]

But you get all the parts there, right? Not that I missed a part in previous chapter, like not earning it with the boat ride for example.

[taikucingg]

yes
i wasted my time searching the flamethrower parts
it's just like the laser on Zombie Infection 1
but ZI1's Laser can be used anywhere as long as you dont run out of energy