xZorro
xZorro [iTunes link, free] is the iPhone version of the classic game XBill - it was very popular at the end of the '90s. It's an arcade style game, featuring a bespectacled character known as "Zorro". Your goal is to prevent Zorro's legions of clones from installing "Wingdows", a virus "cleverly designed to resemble a popular operating system", on a variety of computers running other operating systems.
