Activision has officially launched Call of Duty: Heroes, its 3D combat strategy game for the iPhone and iPad. Unlike the companion app for Call of Duty: Advanced Warfare launched earlier this month, this latest offering is a full standalone game like Strike Team.

While the basic game is free to play, you might want to take note of the cost of the optional in-app purchases before you get hooked: these range from $9.99 to a frightening $99.99 …  expand full story