[XFree86] Game Locks up in XWindows, how do I get out without restarting

[Paul Wharff]

I'm farely new to the linux/unix world.  I just installed Railroad Tycoon II and occasionally it locks up, but I still have control of my mouse.  How do I Force-Quit it like on the Mac or do the 3-finger-salute like on Windows or how do I kill any application for that matter. By the way, don't tell me to use the "kill" command, I know this, however my problem is that I'm stuck in this game and I can't get back to the Xwindows file system.  Thanks for any of your imput in advance.  --Paul