$XBILL is based on XBill, an old open-source game made in 1994 for the X Window System.
The game is about a little blond nerd named Bill who clones himself into an army of “micro-Bills” and runs around infecting computers with Wingdows.
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You play as the sysadmin: click the Bills before they reach the computers, put the stolen operating systems back, and stop the virus from spreading through network cables using a bucket of water.
Yes, that was the actual game.