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Mac Game Store is running an Ubisoft Summer Sale. Some of the games use Steamworks.
Babel Rising $2.49
Might & Magic X – Legacy Deluxe Edition $7.49
R.U.S.E. $2.49
R.U.S.E.: Pack Of The Rising Sun DLC Pack $2.49
R.U.S.E.: The Chimera DLC Pack $1.74
Rocksmith 2014 Edition $15
The titles above all activate on Steam.