He means 'Assasin's creed'. And yes, some of the levels are hard. The combat is usually pretty easy, but some of the jumps/acrobatics take a while to master. The game is also really long. By far the longest game I have played on the iPhone, as long as Half-Life 2 IMO.
I found level 3 of Samurai to be pretty tough... but it sure felt good beating it After that the rest of the game was a piece of cake.. but you can give yourself a good challenge in the dojo. Haven't tried playing again since the update. I will add Defender Chronicles and Blocked. DC was decently challenging as a tower defense game though probably not the level of difficulty as Geodefense. Blocked was pretty tricky for me and was a game where I couldn't put it down until I beat every level. I don't play a lot of puzzle games but I would think that many of them are probably pretty challenging. Also I hear the game Geared is tough. My 2 cents.
[app]Squareball[/app] is one of the hardest games I've ever played. I had to retry every level multiple times before I passed them, so I'm pretty sure you won't finish it in a few minutes.
I find Nano Rally on Pro difficulty is quite hard. Or maybe that's just my extremely poor racing skills.
