I can recall getting to the penultimate dungeon in Twilight Princess, and just running out of steam entirely. Didn't feel like escorting the orbs; had read about the things that let the endgame down.

Final Fantasy IX (9): Just didn't feel like continuing in the final disk. The atmosphere had changed to become a bit oppressive, felt like I'd seen the best of the game already and that it was on a sharp decline.

I think I bailed somewhere late in the Gym Leader Challenge in Stadium 2 or perhaps even Round 2, because even as obsessed and hyperfocused I was, I wasn't about to start EV and IV training. (Lay: Doing specialized training to raise base stats that basically involves obsessive genetic profiling.)

On a different note, I'm getting filtered on Cave Story because I simply don't have the patience to do Last Cave in Cave Story.

I guess there is the separate thread for games people have abandoned. I have mainly mentioned Daggerfall there over and over again, and still tried to continue playing it, especially since the Unity version fixes so many quirks.

However, I am again at least on a hiatus, possible permanently, from Daggerfall (Unity). It just seems so pointless to continue, and I just hate the randomly generated dungeons that are all over the place.

There is this one dungeon now where I am supposed to find some letter or something. I have carefully inspected every inch of that dungeon, and there was one magically locked door left, and I presumed the letter must be behind that door.

I just couldn't figure out any way to open the door. Googling for it, the instructions on how to open magically locked doors were very vague and contradictory. Some suggested it can't be bashed open (physically), some suggested it might be possible to open with spells (didn't work, not sure if I am just not high enough level), and some suggested there must be some switch somewhere, possibly nearby, that opens the magically locked door.

The problem is that that switch can apparently be pretty much anything: a torch in the wall, a skull lying somewhere, anything. So I wander around touching every torch or skull or a pile of stones in the dungeon, to no effect. The door just stays shut and that's it.

Then I decide fjuck it and use a cheat code to open the door (that is one of the things I like about the Unity version of Daggerfall, it has console cheats that can really save your day, e.g. I could clear my criminal status with it, apparently I had done something that caused guards to always attack me in one region, making it impossible to continue quests there; the normal suggestions like just waiting it out etc. didn't seem to work, and I had no idea what I had done wrong to make myself a criminal).

So I open the door with a cheat code: and no there is no letter there. It is a small room where there are three switches there that possibly open some other doors, but I have no idea which doors since I haven't seen any more unopened doors anywhere.

So I use another cheat code to reveal the whole dungeon map, to see what I've possibly missed. It turns out there are SOME rooms floating somewhere that are not connected to the rest of the dungeon. So is the letter in one of those rooms, and how exactly am I supposed to get to them? Apparently through some portals that I just haven't seen anywhere?

At this point, this just seems totally pointless and I haven't had fun for with the game for a long time. The totally random and illogical nature of the game just kills it for me, trying to guess what does what. A skull, torch or a pile of stones is a switch that opens some door or teleports you somewhere else? Come on! Just as logical as it I'd have to pee on my enemies in order to kill them in combat.

I really should give the game an eternal rest, and consider it "yeah nice but failed concept for its time". I am sometimes just too stubborn to do that to games.

The Witcher 3. 180+ hours and still didn't feel like i was anywhere near finished.

Probably didn't help some of the DLC side quests were tedious/complete shite.

Dead man's party is a stand out crap fest.

Atlas Fallen: Reign of Sands. It became too annoying towards the end and i give up on things that become too annoying to deal with.

When I was young I would get to the end of the game and just give up.

Cyberrace. Got to the last race. I remember playing it once and losing. I have no recollection of playing the game after that. I certainly never finished it.

Half Life. My first FPS, not counting the shareware Wolfenstein-3D. I believe I got up to the final boss, but I don't think I beat it. I ultimately finished it several years later.

The original Rainbow 6. Again the last mission.

Crimson Skies. Again the last mission. The mission started as a race, which I never managed to beat.

The latest is probably The Detroit After. It's basically a Hotline Miami clone mashed with RoboCop. It was.. ok, I guess, but at the end of I think level 5 you're given a choice not to kill your target (because it's an unarmed civillian). However, if you choose to not to pull the trigger... the game just ends. You're told you're character got decomissioned, and you have to start the whole game over. Yes, not just that level, but the whole game. Granted, the levels are short, so it wouldn't take too much time, but I was so pissed off by the very idea of giving the player a choice that only leads to deleting all of their progress without warning I dropped the game right then and there. And if I didn't buy it for the laughable sum of 1.79 PLN I'd demand my money back too.

The final boss of Half-life was widely panned back in the day, everyone seemed to hate that end-boss fight.

Except me. I thought it was great, and really enjoyed it, and I've replayed the game and that end-boss several times. IIRC, I usually sniped its brains repeatedly with a crossbow or some other sharpshooter weapons, after the boss opens up its head to reveal the brains. The whole scene, a huge alien mutant baby floating in the air, was both funny and eerie at the same time. As was the rest of the game, basically.

The only end-boss I recall enjoying even more was the one from Portal, another Valve game. It just cracked me up when it tried to convince me in different ways to not to do what I was going to do, and it was kinda interesting too to figure out how to achieve it, step by step. It was interesting, not frustrating like many end-boss fights.

I think it was my last Distant Worlds 2 game, about a month or 2 back in time. The prospect of the amount of work involved in waging 2 wars and pursuing a galactic conqueror role and the rest of life's responsibilities became a bit daunting

I think I made it to the final chapter, or before the last one, in Resonance of Fate. The gameplay is good but at least in RPGs the story is essential to keep me engaged; and the one in RoF is absolutely idiotic. Just a trio of mercenaries doing odd jobs to odd people. The fanservice was also very cringeworthy - the wine scene comes to mind. I kept playing hoping things would get better but I was just hating the game more and more, ignoring the sidequests just to make it to the end faster. Ultimately realized this was just a waste of time and dropped it entirely.

Speaking only of games I've actively put down (as opposed to those I've just drifted away from in favor of other games), the best example I can think of is the Windows port of Star Wars: The Force Unleashed. I have to think there was very little of the main campaign left, but after replaying one awful, continuous series of glorified-QTE set pieces several times, only to keep failing/getting stuck on the bit where you have to (IIRC) pull a Star Destroyer out of the sky, I basically gave up. Maybe it would've been better had I had a controller at the time, as opposed to playing with mouse & keyboard, but the reputation of the PC port leads me to think not -- though maybe the controls for those bits would've been a bit more intuitive, at least.
Maybe I'll reinstall it and try again at some point, but I might have to wait a few more years for the annoyance to fade from memory.

That reminds me of MegaRace. I don't know how far into it I'd ever got, but "roll credits" wasn't it.

Most recent examples:

Blasphemous 2's last boss. A completely impossible and incongruous boss fight. Nothing like the rest game. Or the previous game (that I 100%ed)

Dead Cell's final (true final) boss. It's practically impossible to GET to even with the game's assists on (including "infinite lives"), let alone beat it. I did it once. And haven't played the game since. Technically it requires twice to get the "real ending". Loved that game up until the 4th Boss Cell. I did everything "clean" with no assists, including completing 4th Boss Cell. But it just wasn't fun after the 3rd and I let myself go wild with the assists on the 5th. And it's not even fun with them.

Elminage Gothic: Ibag Tower, around 6F or 7F. At this point, the game just gets ridiculous. There's the Archer Polete enemy, who has higher agility than your characters can possibly have, gets two actions per turn, and can attack 4 times for 400+ damage per attack on *each* of those turns. Add in the possibility of using Tarot (I saw a video were that poisoned the party, and then the enemy's Pursuit Sweep killed the entire party, all in the surprise round) and it's not exactly fair. Also, random doppelganger encounters that give no XP, yet you can't run from them. Add the fact that loading your mid-dungeon save causes a bit of time to pass, slowly aging your characters, and I ended up quitting at that point. (Note that this is well into the post-game, though this dungeon has more floors than the other two post-game dungeons combined.)

I also bailed out on Cave Story, but it, again, happened in post-game, mainly because of boss of the bonus dungeon, and specifically that the camera focuses on the boss rather than the player. (Note that this is after that Last Cave; not only that, it's after the harder hidden variant of that dungeon.)

Odallus: The Dark Call
reached the final boss, fought him a couple of times and then I got bored and dropped the game

Shadow Warrior 2013. Not that I plan to completely abandon it, it just got so tedious and boring mid-way through that it's one of the few games I outright wanted to take a break from instead of merely losing immediate interest.