The Sky Crawlers: Innocent Aces (スカイ・クロラ イノセン・テイセス Sukai Kurora: Inosen Teisesu) is an arcade combat flight simulator exclusive to the Nintendo Wii. Its story is set prior to the events of the 2008 anime film The Sky Crawlers, an adaptation of Hiroshi Mori's novel of the same name. Innocent Aces was co-developed by Project Aces and Access Games, and produced by Namco Bandai Games. Its gameplay systems feature many similarities with the Ace Combat series. Innocent Aces had numerous lasting marks on the Ace Combat games, most notably through the introduction of propeller aircraft.