Question: Which Apple operating system did the game that was a sequel to the Mac-exclusive "A-10 Attack!" require?
Sentence (from "IPhone OS 1"): No official name was given on its initial release; Apple marketing literature simply stated that the iPhone runs a version of Apple's desktop operating system, macOS, then known as OS X. On March 6, 2008, with the release of the iPhone software development kit (iPhone SDK), Apple named it "iPhone OS" (they later went on to rename it "iOS" on June 7, 2010).
Relevant evidence: No