At least 4 different prototype versions exist, all with varying degrees of differences with graphics and sounds.  The earliest known version, dated 10-13-83, lacks a title screen and has a purple Solvalou (pictures #1 and #2).  A later version has a title screen, but with a “Namco 1984” copyright date and a blue Solvalou (pictures #3 and #4).  A 11-23-83 version has the correct “Namco 1982” (picture #5). The latest known version, dated 1-4-84, has a different-shaped Solvalou that fires small shots (picture #6). There's also a version with a detailed title screen, but this was done outside of Atari.



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