By the early 1990s, the IBM PC platform dominated the market for computer games. In December 1992, "Computer Gaming World" (CGW) reported that MS-DOS accounted for 82% of game sales in 1991, compared to Macintosh's 8% and Amiga's 5%. In response to a reader's challenge to find a DOS game that played better than the Amiga version the magazine cited "Wing Commander" and "Civilization", and added that "The heavy MS-DOS emphasis in "CGW" merely reflects the realities of the market". Instead of discontinuing the Amiga 500 and 500+, Commodore envisioned it taking the place of the Commodore 64 in the low-cost segment. To make that possible Commodore set out to design the Amiga 600, a system intended to be much cheaper than the Amiga 500. The Amiga 500 itself would be replaced by Amiga 1200, also under development.