The initial arcade port published by Sega in 1988 in the U.S. The European release, published by U.S. Gold, followed in early 1989. The most obvious difference between the two versions concerns the copyright dates on the loading screen (i.e. © 1987 vs © 1988 - see screenshots). Other differences include the latter version exhibiting a moving starfield on the loading screen, a demo more like the coin-op, and a slower game timer.
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