Firaxis and 2K Games have been busy with Apple's iOS platform. On top of Haunted Hollow, the studio behind XCOM: Enemy Unknown has released another free-to-play game for Apple's mobile devices. This one comes from Sid Meier and ventures to the days of World War I. Sid Meier's Ace Patrol is a turn-based strategy game that mixes in enough RPG elements to make you want to fly beyond the free-to-play horizon.

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Sid Meier's Ace Patrol is now available on the iOS App Store, and Firaxis has produced a trailer to show off the game in action. The newsreel presentation shows off a few glimpses of the strategic movements, in-air combat, and upgrades available.

Watch: High-flying combat »