Stardew Valley. He keeps adding things before I finish what was already released.

I like skyrim, but completing it is kind of missing the point IMO. The draw is to install a whole bunch of new mods and see if the game still works.

Subnautica. I always have a lot of fun building out my base and discovering things and poking around, but after a while I get distracted by another game and put Subnautica on the back burner. By the time I get back around to it, I’ve forgotten how to play and end up starting a brand new playthrough.
Another one is Darkest Dungeon. I have over 100 hours in that game and loved it, but I kind of stopped playing after all the strategies I had been using stopped working and all my parties kept getting annihilated. I was spending so much time recruiting, training, curing, etc that it sort of stopped being fun.

Rimworld.

Over the years, on and off, I’ve put 2k hours into that game, and I’ve never, ever built the ship or helped the High Stellarch or found the Archo Nexus. Never even gotten close. I love building bases and growing colonies, and with all the DLC+mods there’s an endless amount to do, but yeah… doubt I’ll ever actually get to the end.

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Most of the games I don’t finish are because I don’t want the story to end. Currently its cyberpunk

Factorio. I’m almost at the stage where you can build the launchpad for your rocket, which is technically the end of the game. But the Pyanomod and Space Exploration mods literally add like 1000 hours or more to the game, and I just think I’ll probably be dead or society will collapse before I finish those up. The game is literally infinite if you want it to be.

Old School Runescape. Kind of a cop-out answer as it’s a MMO, but I’m never gonna get maxed there

Oxygen Not Included

Well no-one else has said it yet but pokemon.
Over my childhood i played a hell of a lot of Red, Silver, Sapphire and Leaf Green, but i never got close to completing the pokedex.

On my first pokemon (silver) i had three pokemon at lvl100, and the rest of the party was lvl95-98 playing the elite 4 over and over and over with a single pokemon just to get the last few levels (after running out of rare candies) but i never got the dex closer than ~30 pokemon off. Even disregarding the trade or alternate version exclusives and the [practically]unobtainables (legendaries from event codes) it was such a grind to get some of the last pokemon with high evolution lvls and i just never managed to finish that pokedex.

I have come to terms that i will never infact ‘catch em all’.

Undertale. Got two of the endings and got to Final Boss of Murder Mode. Tried 50+ times and decided I’m just not skilled enough to beat that boss. Looked up a vid of the ending and was satisfied. What a wonderful game.

Alley cat

And

Zack McKracken

Fucked if I’ll ever beat Nethack without wizard mode.

Death Stranding is another, though for a completely different reason. I know there’s some super cool fun shit somewhere in there; but getting through the first few hours of the game to get to that point is so boring I always end up putting it down before getting to anything worthwhile. And that’s with actually thinking the walking system is pretty kick ass.

Probably Skyrim because I haven’t finished Dark Brotherhood yet, the last major vanilla faction questline remaining

Risk of Rain 2 for me. I’ve “finished” the final boss but there’s so much more to unlock and do in that game that I’m not sure I’ll ever be done with it. Absolute blast to play with friends especially when you get those miracle runs where you get all the items that are amazing for your respective classes!