One of the hardest games ive ever played would have to be Super Ghouls n Ghosts on the SNES. When you first play through it you think you getting a simple platformer but it immediately becomes the biggest frustrations you've ever seen in your life. Even on easy mode its as hard as heck.
But despite the intense challange I finally faced off aggainst satin and his green other half before the final boss battle just to discover I needed an item called the goddess bracelet before I can enter the final boss battle.
So back to level 1 the game sends me to supposably beat satin again with the bracelet wepon that is completely usless exept you need it to see the real ending of the game. I bet alot of people would give up at this point, but I actually played through it all again, and I couldnt beat satin this time. Those devils are possibly the worst enemy in the game because they just dodge your attacks like theres no tommorow and do a down ward swoop thats almost impossible to avoid, I swear the game developers seamed to just throw those guys in just to be annoying.
After dying several times at level 7 in an attempt to get the bracelet back after failing to kill Satin with it I just gave up. Its been awhile since a game drew me in like this one did, and Its probably one of the latest games I stayed up to play.