for me, its probably The Prince of Persia for the ps2. there's a puzzle when u have to go through the right door to reach farah. problem is, there's 2 floors and like 10 doors on each floor. I spent days trying to find a patern but I was like forget it. 6 months later, went on gamewinners.com and figured out how to beat it. beat the game that week lol.
as of recent, I haven't played ssf4ae in since the summer. the game so unbalanced. ill pick it back up when ver2012 comes out later this year.