This has to be the hardest Ecco the Dolphin game out of the series. Its a toss up between this game and Ecco defender of the future. Ecco 2: The Tides of Time wasnt that hard but then again when i first played it i used the cheat code to get through the whole thing.

~Arkonviox
Ecco the Dolphin on the Arkonviox Network
http://www.arkonviox.com and http://www.arkonviox.net