Minesweeper (just kidding, that one is only for the lols)
Have to say the hardest game I played was Online Chess (broke a mouse and a keyboard from all the frustration, lol (don't worry, they were like 5 years old and the combined price was 10$ when new) in the end I won against some random Romanian guy on time and swore never to play Chess again (only exception would be if I play it with a girl in Iceland, because apparently, it's against the law to play Chess while having sex in Iceland, talk about being a badass outlaw)
From normal games... Um... I remember hitting my keyboard on the Helicopter mission in GTA Vice City (didn't break it though)... Other than that, mostly Sega games, but which one was hard? That is harder than others... Don't have a clue...
Alladin was hard I guess, remember I always used to pass a lot of stages using cheats (press start and then A,A,B,B,C,C, A,A,B,B,C,C, A,A,B,B,C,C...)
Oh, I wrote too much for such a simple question