If you don't own an iDevice, you might have missed out on the mobile strategy title Total War Battles: Shogun. The game was a bit simplified from its PC counterparts, but it relied on the same core mechanics. It even came from the same team as the standard Total War series--and now, the game is available on PC and Mac via Steam.
The real-time strategy game offers a 10-hour campaign across a hex-based map, and the Steam version offers Achievements and leaderboard support. Plus it's only $7.99, not too far above the iOS title at $4.99.
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