Last week we shared news that Might & Magic: Clash of Heroes is the first of October’s free Games with Gold. Today we know that Halo 3 is rounding out the month.

From October 1^st through 15^th, you can download Clash of Heroes at no cost if you’re an Xbox Live Gold subscriber. From October 16^th through 31^st, it’s Halo 3. If you happened to miss 2007’s Halo 3 (or the three main series titles since then), this seems like a good time to put on the Mjolnir armor.