XBill
XBill is an arcade style game for the X Window System. The game features a bespectacled character known as "Bill" (a spoof of Bill Gates). The goal is to prevent Bill's legions of clones from installing "Wingdows", a virus "cleverly designed to resemble a popular operating system" (a parody of Windows), on a variety of computers running other operating systems. It was very popular among Linux gamers at the end of the 1990s, beating out Quake, though not Quake II, as Linux Journal reader's favourite Linux game in 1999.[3]