Electronic Super Joy. Getting the star on Hell Club made me want to tear my eyes out and feed them to a giraffe.

super meat boy and binding of isaac

I played Battletoads.

Demon's Souls and Dark Souls

Mermaid Madness

Ghost'n'Goblins, in the old days. I'm not sure I even saw one time the end of the first level :)

Super Meat Boy, Ninja Gaiden series on NES... hmmm, what else... Manhunt on hardcore difficulty setting.

FTL - Faster Than Light (easy mode)

I Wanna Be The Guy and the Touhou series.

demon's souls or Vanquish.
Demon's souls was more difficult in general, while vanquish challenges are hard as balls :P

Super Hexagon is pretty tough.

WTF, A Virus Named Tom was hard for you?

What was it like TMNT 3? On the snes or nes I hardly recall. Mostly because repressed memories of that game.

Ikaruga and Alien Hominid theyre both too hard for me

Battletoads is hard as hell.

Rock, paper, scissors.

Never played it, but I know that Dark Souls is one of the hardest games there is.

Magical Drop V

Star Wars: Rebel Assault..

That game was a bitch.

Life.

VVVVVV or super hexagon.

Super Spy Hunter, for the NES. Used to try and try and try to beat it in the late 90s. Always thought I got close to the ending but then I kept dying. Fast forward over 10 years ago, played it again on PSP (NES emulator, blah) using save states, wasn't even close to the ending. In fact, I never did get around to finishing it, guess I should one of these days

Super Ghosts and Goblins on Super Nintendo (Some of you know the original arcade cabinet without the Super in the name.)

Hell of a game.

Rastan Saga arcade cabinet. It ate up all my pocket money within 1 hour every week. And 20 bucks a week with a game costs 1 buck for 3 lifes is awesome.
Nam 1975 arcade cabinet waas another pocket money killer and I never finished it.

Super Mario Bros. NES - World 8