title: Official versions of Doom
context: Doom is one of the most widely ported first-person shooter video games. Starting with the original MS-DOS PC version (released as shareware on December 10, 1993), it has been released officially for a number of operating systems, video game consoles, handheld game consoles, and other devices. Some of the ports are replications of the MS-DOS version, while others differ considerably, including modifications to the level designs and monsters, with some ports offering content not included in the original MS-DOS version.
question: When did Doom first hit shelves?
answers: December 10, 1993