haven't played it in a while, but I do own a copy. This game wasn't being sold anywhere in Canada, so when I caught wind of it, I knew I had to get it. So I turned to eBay, and within a week or two it was at my front door. I finished it in just a couple days. I do wish they'd make a sequel.
If you still had it, I could help you easily. I beat the whole game, and came up with my own shortcuts to get it done quick. What stopped you from passing the sewer level?
I'll admit to doing that myself with PS1 games... PS2 got more complicated, so throughout the years I automatically scan the instructions with any new game I get.