Life.

Grabbed by the ghoulies. xD

Ghost & Goblins x_x
Crash Team Racing (I mean you have to be skilled)
Postal 2, only when there's alot of baddies front of me xD

Half life 2 was a little confusing at times.

The Ghost & Goblins arcade games series consists of about 3 games but what the heck I thought of a fourth one. Wolfenstein 3D is pretty challenging, especially since you have to work with the basic controls you have: moving and shooting. Nothing else. And since that means you have to be resourceful and riskily bait enemies right to where you want them and most often stunlock the heck out of them, it's pretty darn risky gameplay. Have you ever tried to stunlock a Shutztaffel? You'd be scared to heck he'd rip through you if you don't mash that CTRL button fast enough, because he actually can.

PAC-MAN
(And being a solo host of Graal-Man)

I don't play very many games, lol.
But CoD WoW's campaign was kinda hard. So many grenades.

1. Pokemon: Explorers of time. I still haven't defeated Dialga, it's too OP.
2. Ghost Trick: Phantom Detective. This had me stuck for quite a while, but I got through it eventually without any walkthroughs.
3. The hardest game in the world http://armorgames.com/play/1043/

Worlds hardest game 1 & 2... The highest level I got on 1 was 23/30

Rogue.

Look at me, I can't stop thinking of the most difficult games ever. Well, wolfenstein isn't that difficult but...

1.Graal
2.Blood&Soul
3.Полный пи

Not really hard but i broke a few mouses/keyboards playing LOL/Dota

Mike tysons punchout and Super C.

haha do you play Ryze in LoL and break your keyboard facerolling it?

The Japanese exclusive version of Super Mario Bros. 2 might just be it for me.