And you thought you could only play Gunz on Windows! Well, I play on Linux. So hah. How? I haven't hacked the code, and I'm not running an emulator. I'm using Wine.
Wine is a program that installs Windows programs on your Linux - without emulating. I've used this for many applications, including mIRC and Opera, (because I can't seem to download the source for it without it corrupting). And I've used it for Gunz.
So, get it here, first of all! Download the correct package for your distro. Then, follow the steps found here. (Click your distro)
so, now Wine is installed; good job. Well, for Gunz, you'll need to manually download the installation files, found here. For the purpouses of this walkthrough, download to your desktop. Launch a Terminal, and type in the following:
wine /home/*user*/Desktop/GunzInstaller.exe
And the Windows Installer launches! HUZZAH! You can proceed like normal from here. Note that it will attempt to install to your C:\ drive, but that's normal; Wine creates a fictional C:\ drive for you. And you can launch right fron ijji.com!
Post if you have any questions or problems, but please include your distro and version.