POLARIS
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A prototype version exists that lacks the Taito copyright on the title screen. It says “POLARIS BY THE ELECTRIC BOAT DIVISION OF TIGERVISION, © 1983”, instead of “POLARIS BY THE ELECTRIC BOAT DIVISION OF TAITO © 1980 AND TIGERVISION, © 1983”.• 2 versions exist! The PAL version doesn’t have “POLARIS” flashing on the title screen.