Air Duel

Released by Irem in June 1990, this is a vertical-scrolling arcade shooting game. To counter the invasion by the secret society D.A.S., players choose between a helicopter capable of omnidirectional attack and a fighter jet specialized for concentrated frontal firepower, embarking on a mission to reclaim seven stages. The understated yet beautiful graphics, characteristic of Irem’s work, vividly depict a tense battlefield where the fate of humanity hangs in the balance. Notably, this title serves as a valuable historical artifact; on original hardware, unique behaviors in audio and display output occur if a coin is inserted or the system is reset at the initial warning screen—a technical quirk that preserves a piece of hardware history.

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