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Flight Simulator X is on sale for $14.99 (50% off) as the Games For Windows Marketplace Deal of the Week.
It’ll be on sale until next Thursday.
The game has an 80/100 metascore.
Keep in mind the sequal to this game called Microsoft Flight is in closed beta at the moment. It will be free to play according to this PC Mag article and uses GFWL. Most likely there will be a limited free flyspace area and/or vehicles.