Ecco the Dolphin II, released in Japan for the Sega Genesis, continued the underwater adventure of the original title. It likely presented similar gameplay, focusing on exploration, puzzle-solving and evading aquatic threats.  The Japanese version may contain some differences to the US release such as localized text and minor adjustments.  The core elements, however, will remain the same.

Ecco the Dolphin II (Japan)

Ecco Jr. (USA, Australia) (March 1995)