On my first time trying to play through Dark Souls I got completely stuck on the Bell Gargoyle boss and pretty much gave up the game for quite a long time. I did eventually go back to the game and finished it. Now it's one of my favourite games of all time, but back then I just couldn't get into it no matter what.
Another one is Resonance of Fate where I was stuck in one of the bosses for a long time. I've only played the game through once, and I started the playthrough in 2010 and didn't actually finish the game until earlier this year. I would from time to time try to get back into it, but was never really able, until during summer of this year I finally decided to just get through it no matter what.








