Gunner 3

Gunner 3 cheat codes: 
Unlocking all weapons and levels:
First thing you have to do is save a game.
(You can do this directly before you start a level - even before the first one)

Now you have to locate the gunner3.ini, which is located in the root directory
of the drive where you have installed the game (i.e. c:\gunner3.ini if you have
it installed anywhere on drive C).

Open this file with the notepad or any other editor and you will
see the following:

[Save Slot 1]
Gun2=0
Gun3=0
...
Gun21=0
Gun22=0
Level=1
Number Of Weapons=1

Change it into:

[Save Slot 1]
Gun2=1
Gun3=1
...
Gun21=1
Gun22=1
Level=8
Number Of Weapons=22

And when you load modified savegame, all 22 weapons & 8 levels are unlocked.