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Out There (Omega Edition if you'd like) - basically everything is RNG, so you can only blame your luck, whenever you lose.

Super Ghouls n Ghosts, large portions of my childhood were ruined to getting the fairy ring ending,

and even beating it the first time without that crappy ring isn't a walk in the park.

All the Touhou games, danmaku ftw

Hardest game EVER: Volgarr the Viking. If you ever beat it, I will kiss your feet. xD I couldn't even beat the first level and I'm not really someone who can't beat games. :P

Super Meat boy

First playthrough of System Shock 2 back in 00s ripped my ass apart, because I had made a build far from optimal one. Second and consequent playthroughs on Impossible were quite easy with a proper knowledge of the game

Gothic 2 night of the raven. Super Meat boy.

Yeah, dark souls is hard, but its basically trying and "git gud" over your mistakes. Game is easy once you know "things". A game when one mistake is heavily punished can't be considered actually "hard" because it was YOUR mistake. However, I undestand why the community (and myself too) consider Dark Souls a hard game.

Hm, I'll keep it to Steam Games. As achievement hunter a lot of games can become stupidly difficult. But if you are asking for normal playthough only:

• La-Mulana is pretty difficult, although one could say it is partly to the game mechanics and controls
• All Y's games are tough, but you can power level a bit and ease the pain
• Our Darker Purpose is for some people hard due to its random nature. But with a bit of time you can become pretty succesful.
• And the last one, the for more most difficult game I posess: Teleglitch. From 10 levels I have seen 7. Even if you are paying attention this game can kill in the blink of an eye. I think from all played games on my account this is the only one I couldn't even finish.

There are more but I think those are enough for the moment.

Commandos, blackguards ...

Boid and Kingdom Rush =D

Hmmm.. I guess maybe Kingdom Hearts 1 cause I was a little kid when it came out and I just could NOT beat it for the life of me but then I got older and actually finished it. The main reason it was hard for me was the final boss.

Dark Souls 1/2, Super Meat Bot. Also there was this game with planes, for PS1, don't know the name but it was so damn hard.....

Looks like a lot of people don't play roguelikes here. They are crazy hard.

Well, I'd say Dark Souls, but since it doesn't have a difficulty setting, I'll go with DMC3, that shit was fucking rad

Ufo:Aftermath was pretty hard , took me a while to get hold of the advancing difficulty
Dead Space was challenging for me , even on easy
I might just be bad on those games , I don't know

I remember feeling particularly proud about beating Stunt Driver for the PS2.

I wanna be the guy. It's not for Steam but you can play it for free. Makes some games like Super Meat Boy to look like a playground.
Honorable mention for Steam: 1001 Spikes. It will test everybody's patience for good.

Super Meat Boy was really hard, haven't managed to complete it but it's really unforgiving.

Among 'the newer games' I would just say Dark Souls like most have already said. But I think that there were harder games amongst Commodore 64 / NES games. On C64 the difficulty usually came with the thing that you couldn't save, savepoints were too far away or you just didn't know what to do and there weren't any guides unless you bought game magazines like ZZap!64 (also included a c-cassette which had some game demos), Mikrobitti (magazine here in Finland, usually had great hints like the protip here)

Then there were the Ultima series. Oh boy I had some great time with those games even though I didn't really play them through most of the time. But you can have great time flying with hovercard and shooting bears with lasers (Yep, first Ultima was a bit scifi compared to the sequels). Also Castle Master was quite hard back then but had really great music. Aaaaand my first game Monty on the Run, never completed nor knew what items to choose in the menu and what could I do with them.

Just to say it short: There have always been difficult games but I think that Dark Souls is the most known of them. I think that the reason is that the development team just thought that we want to make sequel to the Demon Souls and make a hard game. Nothing else matters.

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for me any game is hard since i'm terrible, but i remember some old console games being specially frustrating

NES battletoads
SNES spawn
N64 mischief makers

on pc i could list most games i played xD

Barney's Hide and Seek game. I can never find him :(

Probably Dark Souls 2. Not that it was better than the first, but because some of the design decisions made the build I chose more difficult than I expected, and some of the mechanical changes made it more difficult to break out of my muscle memory.

rocket league