[url]http://majornelson.com/2013/09/30/games-with-gold-might-magic-clash-of-heroes-and-halo-3-free-in-october/[/url]
Might and Magic Clash of Heroes from October 1st until October 15th. Halo 3 from October 16th until October 31st.
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Maybe it'd be more appealing if the Halo 3 was like a... "GOTYEY" (game of the year every year) edition which included all the map packs. The map packs are what people generally need.