/vr/ - Retro Games

Hello /vr/ I don't visit as often as I should, so I came over here to ask you what are some really hard retro games? I am tired of people telling me a game is hard, only to find out that with any small amount of forethought the game is barely challenging.
I know that a lot of older games had a lot more difficulty to them for various reasons, some say that it adds to replay value, others say something about getting your coins in the arcade. Whatever the case I would ask you to recommend some really hard games that kick your teeth in at every turn. Picture related for being known as a really hard game, although I am sure there are more difficult ones I have never heard of I am having a blast playing it.