ok i have attatched a cracked Gunz.exe renamed to GunzMulti.exe. just put this in the gunz dir and use this instead of Gunz.exe.
ill also tell you how i made it here :P
ok you will need to use ollydbg on gunz.
now right click the main window and go to search for/all intermodular calls.
look on the list for the "Kernel32.CreateMutexA" call now double click it.
you will be back to the main screen, now right click the highlighted CreateMutex call and goto binary/Fill with NOP's.
ok next get back to the intermodular call screen and search for the "WS2_32.Bind" call. double click it to get onto the main screen again.
ok now look down a fyew rows for something like this
JNZ SHORT Gunz.00511D2D
double click it and change this to:
JMP SHORT 00511D2D
ok thats it, now all you need to do to make this permanent is right click that line you just changed and goto Copy to executable/All modifications. then choose copy all on the dialog box. next right click the binary screen that appeared and go to save file to save the cahnged you have made.