XBill (1994, Linux)

XBill is an arcade game developed by Psycroft. It is a free and open-source game and was also ported to Windows, Mac OS X, OpenMoko, Android, Maemo, iOS, FreeBSD, AmigaOS, BeOS, HaikuOS, OpenBSD, NetBSD, OS/2, Solaris and OpenSolaris.

You can get the game at http://www.xbill.org/ .

An evil hacker suing the handle "Bill" wants to install a virus under the guise of a popular operating system on your computer. To make matters worse, he has created millions of clones of himself who all attack your computers. You need to stop him.

Each level consists of a static screen. A number of computers are on each screen, some of them connected with network cables. Waves of Bill clones will come towards the computers. You can make the Bills explode by clicking on them. If a Bill reaches a computer, he will set aside its OS and placing the virus on it. If you drag the OS icon back on the computer, the virus will be erased. However, once the Bill has finished, he will grab the OS icon and try to leave with it. An infected computer connected with a cable will eventually send sparks through the cable. You have a bucket with water to put out sparks. A spark might cause a computer to burn.