An early prototype of Ecco the Dolphin: Defender of the Future for the Sega Dreamcast dated January 26th, 2000. This prototype contains many differences, including completely different levels and unfinished/unused mechanics.
Note, the original media that this prototype originated from is possibly damaged. Things you see in the video and oddities that occur during play might be caused due to these errors. A restoration effort was done to preserve as much as possible, but it's possible that some parts are still broken.
Ecco the Dolphin: Defender of the Future Statistics For Hidden Palace
Hidden Palace presently has 2,573 views for Ecco the Dolphin: Defender of the Future across 7 videos, and close to 2 hours worth of content for Ecco the Dolphin: Defender of the Future published on his channel. This is 1.11% of the total watchable video on Hidden Palace's YouTube channel.