Yeah, five times!! Right, absolutely, just five... I don't have a rule of replaying the campaign with every update or DLC or holiday event or anything like that. Five.

All the Witchers, Hard Reset, Mass Effect 1&2.

Ditto on Mass Effect. I enjoy replaying several Sierra titles like Space Quest and Police Quest and other point/click adventures. Some stories are worth revisiting like a great book.

Jagged Alliance
Jagged Alliance 2
Genghis Khan II
Allied General

Also pretty sure I've played through the campaigns in Flying Corp Gold 5 times,and at least 5 full seasons in Grand Prix Legends.

But 5 times is a lot, I'd rather play a different game than the same ones.

Baldur's Gate 1 & 2
NWN 1 & 2
Kotor
Dragonage Origin's
Mass Effect 1, 2, & 3
Gangsters 2
Oblivion
Skyrim
Witcher 1, 2, & 3 (Although finished the Heart of Stone DLC only once, I hate timed quests so I only play until I bang Shani)

There pops up a dialogue screen telling you that you have won. You can close it and keep playing but I think it returns once every day or so. There is just nothing to do after you have won though as by that time you are so overpowered that beating bandit bands is boring unless you fire your whole army and go solo and there are NO enemy factions left so no enemy lords to fight. It has taken me around a thousand in-game days to beat the vanilla game.

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About Tetris:

In one version I played, the speed became impossible if you got far enough. You could not even see the pieces as they fell. In another version when you beat the highest speed the game speed went back to level 1....I call that beaten.

About RTS games:

I love to play skirmishes but many are the campaigns that I left half-way through so even with a thousand hours or more in a game I did not really beat it since I did not play through the campaign.

Maybe you should give me tips how to make a level not take 30203503147503475 hours each? I'm finishing up the pyramid one for the first time and want to move right on to the cave, which I haven't played before.

https://www.gog.com/forum/craft_the_world#1529933905

Apart from silly examples like solitaire/minesweeper and such, all I can think of:
- Commander Keen 1
- Test Drive 1
- Warcraft 1 (if counting both human and orc playthroughs)
- Blade Runner
- Possibly Red Alert 1
- Doom 2
- Deadlock 1

Resident evil 2, 14 times.
Metal Gear Solid 1, 46 times
Resident Evil 4, 23 times
Resident Evil 5, 9 times
Metal Gear solid 2, 18 times.
Metal Gear Solid Twin Snakes, 34 times.

Only resident evil 5 I suffered due to co op with a friend. was not happy with that game at all.

Nintendo's NES version fits your first criterion (speed becomes impossible).

Tetris the Grand Mater series actually has an end; once you reach a high enough level, the game ends and (if you did well enough) you get credits. If you get that far, I'd call it beaten, but can you get Grand Master rank?

Chicago 90 ! Defender of the Crown ! Licence to Kill ! Pirates ! Silent Service ! Zany Golf ! North & South ! Archon ! Archon 2 ! Ninja Mission ! Manhattan Dealers ! Hybris ! Star Wars ! Marble Madness ! Obliterator ! Barbarian ! Star Wars 2 ! Star Wars 3 ! Shanghai ! Brataccas !

I cheated in some of those.

Interesting. I had no idea. So the win condition is pretty much "ally with a faction, then help them take over and hold every town and castle owned by every other faction"? Do you have to be max level, as well?

EDIT:
BTW, nice alliteration. ;)

...You played through the entirety of a game you dislike nine times?

Pretty much, when I play co op with a friend I can tend to forgive the game cause we are concentrated on keeping each other alive and such. but when playing this alone I WILL NOT STAND FOR IT.

Resident evil 4 carrying around that ashly girl was bad enough.

Whole idea of the co op was to get the unlimited guns and best stuff unlocked with trying to get 100% achievements on steam.

For me it's

Momodora: Reverie Under the Moonlight
Shadow of the Colossus for Playstation 2

And maybe Metroid Fusion, but I don't remember exactly how many times I played through it. I remember playing it a bunch, I just don't remember the exact number of times I beat it.