For me:
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Breath of the Wild: 400 hours in, have done only 50% of the game. But now that TotK is out, I’m not sure if I’ll ever complete BotW. Perhaps if I’m stuck on a deserted island with my Switch and have nothing better to do, I may pick it up again.
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Skyrim: Countless hours, never really done much of the main storyline, always get lost in modding and optimising the game. Own it on practically all platforms too. But one of these days, I’ll get to the main quest…
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Dangerous Dave: Been playing this DOS game on and off since 1990 but still haven’t managed to beat it. I always die around level 6/7, blasted sun keeps killing me.
I think I have 50+ hours in Dark Souls III, and never went past the Abyss Watchers. Either I get frustrated and quit for months, or I have a technical issue and my save is lost. Then I start a new save, rinse and repeat.
I also have 200 hours in Binding of Isaac, still play it regularly, but will probably never truly finish it. I’d be happy to reach the final final boss at least once, but the last DLC is really hard.
There are other games I never finished after many hours of course, but those are more open-world/free-roam games, so I don’t really count them.