Credits to HackerPro and to me that I translated it to English

You need:
Ollydbg
Gunz.exe (original file)
Working and Updated................. BRAIN

1º- Open ollydbg and load Gunz.exe, wait when it analizes.

2º- Right Click- Search For- All referenced text strings
A new window is opened, maximize it.

3º- In that new window, Right Click- Search for Text
And in that new box type gzr and check the two squares and Search.

4º- The first result is not what we need so press CTRL+L for search next
two times (so is the 3th result). That gzr is between "Gunz" and "International Edition". Double click in that gzr.

5º- You went back to the main window and now u can see in the gzr section 3 call comands.
Double click the 2nd one and change CALL XXXXXX with MOV EDI, 0FFFF and hit ok.

6º- Some lines behind the CALL that we have modified we can see a JNZ command in a line, select that line, right click- binary- fill with nop's

7º- Right click somewhere- Copy to excecutable- All Modifications- Copy All
And in the new window right click- save, and put somewhere your new runnable.

Then you can see in other tutorials for adding name hack, disabling cuss filter, activating godmode. and other things.