[Phylum]

Maybe challenging is a better word then. I still find the game fairly demanding to play, and I've spent a lot of time playing all of the games in the series. Part of it comes down to when you're forced to interchange platforming with the weird auto-aim gunplay. Part of it comes down to ridiculous sections, like when you ahve to escape the palace.

As far as PS2 games that I've played go it's definitely one of the hardest, and I've played most of what I'd consider "mainstream" PS2 games.

e: Plus I hear it referred to as a really hard game all the time so I threw it out there as a point of reference. Stylistically it's a bad comparison to make.