Air Duel arcade flyer.
|Arcade system||Irem M-72 system hardware|
|Sound||Sound CPU : Z80, Sound Chips : YM2151, DAC|
|Display||Vertical, Raster, 256 x 384 pixels, 512 colors|
The game differs from most others in the genre in that you can change the aircraft you use at the start of each level. The jet fighter always shoots straight forward; power-ups increase the width and strength of its shots. The helicopter fires thinner and weaker shots, but turns in the direction it moves (similar to the later Zero Gunner), giving it great range; powerups increase the strength of shots, as well as the number of bullets per shot (adding a small "spread" effect to the shot while moving around).
Both the fighter and the helicopter also start with three bombs which wipe out everything in their path, including enemy shots. These bombs are also unique compared to similar games, in that they produce a line of small horizontal blasts that can be "directed" at the line travels across the ground, by pressing left and right (similar to the helicopter's shots). Additional bombs can be picked up during the course of the game.
Losing a life resets your power and bomb count to the amount you start with. "Air Duel" is a challenging game, and later levels can become nearly unplayable if a single life is lost.
Unusually, all of Gunforce II's music comes from Air Duel, though not all tracks were used and both games are presumably took place in the same setting. Metal Slug X also contains a song on the third stage using a melody from Air Duel's second stage theme. All three games are known to have the same composer and likely the same staff.
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