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The SNES version includes six stages, and a password feature,cite-ref-gp-snes-4-2[4] which is absent from the Game Boy version.cite-ref-nms-gb-11-0[11] The Sega Genesis version includes 15 stages.cite-ref-ago-gen-12-0[12] The Genesis and SNES versions differ in design and graphics, and the Genesis version includes larger Alien character models.cite-ref-13[13] The Amiga version, which has 14 levels, features gameplay that moves slightly slower than the Genesis version, but is otherwise nearly identical.cite-ref-cu-9-2[9] The Commodore 64 version has 15 levels,cite-ref-14[14]cite-ref-c-format-15-0[15] and is a nearly identical port of the Amiga version, but with slightly different level layouts.cite-ref-c-force-16-0[16] The Game Gear version is identical to the other versions of the game.cite-ref-sf-gg-17-0[17] The Master System version uses the same level layouts as the Genesis version, but includes a two-player option.cite-ref-sf-ms-18-0[18] The Game Boy version, unlike other versions of the game, is played from an overhead perspective.cite-ref-np-gb-3-1[3]

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