The two-mega European release of Captain Silver contains stages and enemies that don't appear in the U.S. release. It appears that the Canadian release was the full version, but before Sega/Tonka released the game in the U.S., they pared the game down to a cheaper one-mega cartridge. The resulting game contains only four levels (instead of six).
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Trivia contributed by Psionic, Patrick Bregger.