Games you ALMOST completed

Gears of War - Atrocious gameplay mechanics. I just couldn't get into it...esp coming straight out of Half life 2, Doom and Quake IV.
I had never played a cover shooter and it felt forced and lazy...unlike others e.g Mass Effect

Aquaria - just don't have the patience for that stupid last boss, a pity because otherwise i enjoyed the game.
Gemcraft - a single map takes way too long to complete and a small mistake can possibly ruin everything, just got tired and pissed off and uninstalled.

Golden Sun: Dark Dawn; final boss. I wasn't really enjoying the game when I was playing it but stuck it due to sunk cost fallacy nonsense. Came to a head when at the final boss since he was getting me down in a few hits. Didn't feel like grinding so I just dropped it.

Rain World. At this point I've listened more to the soundtrack than I've played the game... It's a really good and amazing game, but also very challenging and you need to know where you're going. When I was unable to play it for a few weeks, I just felt lost, and that feeling hasn't improved since then. I really want to start it over some day though.

Bayonetta.
I got to the very last boss but with not enough health regen (and not enough skill, I guess).
I tried several times, but couldn't beat it.

I had to watch the ending on Youtube :(

Dragon's Wake (great game until the final fight): tried a thousand times, but could not win the final fight... finally watched the ending on you tube.

Darkest dungeon. 😢 What a game 😳 brutal and desperate. I manage to restart it sometimes but it is so merciless.... But still I love it 😻

Fire Emblem: Awakening. I don't really remember why... I guess I just have a JRPG phobia? Even getting right up to the end (so close to it) I still feel daunted by how much of a burden they are. I think I did the same thing with a couple Pokemon games too...

There are definitely some others (especially bad ones :O) but there's the most well-known I can think of.

Limbo, only "Complete the game in one sitting with five or less deaths" left which always make me go FFFFUUUUUUUU

Godfather. The game says i have completed the main story 100% but in order to be the don of NYC i have to destroy the hostiles compounds and the remaining business. The main problem is that the compounds are way too hard, i have died a million times so i decided to stop for now. If i end up feeling like trying again i will for sure go for it as its so good game.

Legend of Dragoon. And I truly meant to come back to it,but I lent it to a girl who turned out to be a psychopath and needless to say I forgot to ask for it back before parting ways. :/ It's been years,but I still think about it sometimes.

100 000 000 - record was maybe 95 000 000.
can't beat it :D

Hand of fate - can't kill last boss

Believe it or not... Faerie Solitaire.
Still trying to finish it, , a very casual game, because jeeze... so much grind to get all the eggs, hatch them all, and level them all up. In a solitaire game.
Jeeze.

Final Fantasy VIII - despite it still being my favorite FF I've never managed to beat the final boss there.
TES IV: Oblivion - just got tired of closing all those Oblivion gates and dropped the game for good.
The Incredible Adventures of Van Helsing 2 - the final boss again.
Undertale - not the final boss but one of the near-final I think; the game was boring anyway so I didn't really felt like wasting my time on it anymore.
Winter Voices - dropped at the start of the final chapter. Still intend to finish it someday but... it's been like, 5 years already.

There's probably more but those are the ones I can think of right now.

• Halo: I've played it most of the way through several times, but have never ended up finishing it.
• Spyro 1: I was playing it on and off for about a year before my Playstation died.
• Portal 2: Like Halo, I've started it a few times but never actually finished it. Unlike the first, it's just a little too long for my usual gaming sessions and I'm not usually in the mood for it when I have more time to game.
• Orcs Must Die: Every time I pick this up I end up spending an hour or so trying to beat a level with all skulls and burning myself out on it.
• Retrovirus: Co-opped my way through most of this but we never got back together to finish it.
• Serious Sam HD: The Second Encounter: As with Retrovirus - co-opped most of it but didn't have time to finish it, and the other person ended up soloing the rest without me. :(

Vampyr, I almost finished it after defeating some pretty tough bosses but then I got caught up with school and when I returned to it my save file got corrupted Feelsbadman.

Outlast.....something always makes me wanna quit that game.

GTA V - was 70% through the game.. upgraded my PC and wiped my save file. never bothered after that
Mad Max - well, wasn't even close to finish. Just couldn't bring myself to keep playing.
Remember Me.. well over half way i think and put it down in the middle of a fight I couldn't finish, left it for weeks, couldn't remember what the buttons do, keep dying.
Wasteland 2 - Loved it, went on holidays for 5 months while relocating interstate. It's now been 18 months since I played and I can't remember anything about it. Definately going to replay this one.

Can't get through Borderlands 2 DLC's

One tough for me is Sky Force.
For Hard West and LA Noir other games come forward before finishing them :}

I have a bad habit of not finishing games even if the only thing left to do is beat the last boss. Either I start all over again or let it sit in my library for months/years. I don't know if its because I subconsciously do not want the adventure to end or something else.

Hand of Fate - Tried the last boss a few times with no success, gave up on the game.
Domina - Played the game twice, never had enough Gladiators to fight for my life at the end. I might try again some day, it's a fun game.

To me happens a lot in very long games (rpgs like FF or Bethesda games).
Usually invest a couple hundred hours, then get a little burned of the same gameplay, so i swicht to a different short game. After beating that and returning to the game i was originally playing i think "what was i doing, to where im supposed to go" and then i start over en repeat the cycle.

More specific:
FF games: usually when i get the airship sometimes get overwhelmed by all the new locations and then switch game xD.
Rouguelike or games with long spaced savespot: nowadays i dont have too much free time to play, so when a game required minimun a hour or more beetween saves i dont play it anymore.

Cold Fear, last boss, he just keep one shotting me.
ZombiU, game crashed and last save was few missions back.
Silent Hill 2, battle with 2 pyramidheads, still cant beat them.
Fallout 3, NV, 4, Skyrim, Oblivion - Too much exploring and collecting. Eventually i get very bored and just stop playing.

I am alive - I stopped playing it for while and never finished it, it was so boring for me.
Mirror's Edge - I stuck at some point and I was too lazy to look up for a walkthrough.
The Bridge - Game became too difficult and I didn't wanted to use walkthrough all the time.
How to Survive 2 - I was playing with my friends but they stopped playing it so I stopped too.
A Story About My Uncle - Became boring for me.