Ecco: DotF is easily one of my favorite games on the Dreamcast.
In my over 20 years of gaming I can safely say that there were few moments in games that truly blew my mind, but a certain infamous late game area of DotF
was one of those.
To be fair, there were also some really obnoxious parts (ugh, transfiguration) but it doesn't taint my love for this game.
I've also played Ecco 1&2 retroactively, and they're pretty nifty as well.