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Attachment In an early prototype build, the Dark Future segment of the game was slightly different. There was also a "cyborg dolphin" boss that was removed from the final release. It was said to be a mini-boss that also had a machine that would drop canisters that would break upon landing. The machine, having not been finished at the time of the prototype yet, uses a crab for a placeholder.
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There are a number of unused messages hidden in the game's data. There's are also a number of messages hidden in the binary from the developers, likely as either a joke or as placeholders.

WILCOMMEN IN DER SWARCEN ZONE (Welcome to the black zone)
HASTA LA VISTA BABY
ROUND ONE FIGHT
AKARMI.AKARKI EZ (Whatever, Whoever)
WE LOVE THE. DOLPHINS.
OPERATING.SYSTEM
HOW ARE YOU.
HELLO WORD
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The game's head designer, Ed Annunziata, has stated that Pink Floyd served as an inspiration for the music in the Ecco games. One of the game's levels is named "New Machine", a possible reference to the Pink Floyd song "A New Machine".

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