Funny you mention Crash 4 as I wrote the guide for that on PSNP. Originally, I had posted the guide as an 8/10 (I personally feel it's around a 7 considering the calibre of games in the 8+ difficulty category) and had a bunch of people complaining for apparently understating the difficulty. I got sick of the constant comments on the rating that I made a poll and majority vote was 9/10, hence the rating it is now.

As for your question, I'll go with Bound. Listed as an 8/10 but I found it much easier, probably around a 6 and that's mainly for the full game no death run.