As in, games you didn't play at all.  Games that got a price drop before you got a good chance to play, or anything like that.  Don't include games you stopped playing that haven't dropped in price, though.  Like that dirt old copy of Mega Man 8, for Sega Saturn that you spent $400 dollars on, and quit playing after 2 weeks.

For me,  it was mirror's Edge Catalyst.  $50.  I could have waited 2 weeks, and paid 30, since I ended up not playing the game very much at all when it was released.

Another one, Mafia III, which I paid 50 dollars for again, only to have the price drop.  At least I got about 3-4 hours of play.

I should probably play some Mega Man 8 on Saturn before the week is over........

Most of my Steam library

Too many to mention or even count at this point.

Why would you get Mega Man 8 on Saturn unless you're collecting Saturn games?

I'd say probably Dragon Age Origins, played it for a few hours but I didn't like it a whole lot so I just ended up selling it to a classmate since it was just sitting on my shelf.

Just for current gen. I'm relatively experimental with my game purchases and many times it pays off but there are inevitably stinkers too.

Magicka 2 - smaller title, bought off PSN cuz "oh this looks cool". The game is for nerds and I'm not smart enough to invest time into it ;_; think Diablo but to use your magic, you have to use different variations of X, O, ^, # every. Single. Time. And there is an absurd amount of elemental combinations you can create that will make new powers. This is the only title on this list that I didn't get into because the mechanics are too advanced, otherwise I'd probably play it. Everything else looked good.

Ziggurat - smaller title, PSN, "oh this looks cool" except it wasn't. The aiming mechanics are horrid and I never made it pat the first floor due to a complete lack of interest.

Ocean horn Monster of The Uncharted Sea - this looks like a windwaker knock off so naturally.... Oh my god I need this. Well, actually, no one needs this and this has to be one of the least polished titles I've played ._. The camera is statically top down and you're jumping between squares. The art style leaves way too much to be desired. Can't really say much else since I only spent 5 minutes in the game wold before never returning.

Battleborn - this game is good, it honestly is! It's just not Overwatch good and there's not much more to add. I'd legit play this game still if it wasn't completely abandoned online because it does some things better than Overwatch.

Call of Duty: Infinite Warfare - despite a vocal minority swearing this game is underrated, I'm big on FpS and I've been with CoD since MW while my brother well before that. I enjoyed MW1-3 and Bo1-3. BO3 is without a doubt the best game in the franchise to me personally. Coming off that, infinite warfare is lol trash in story, in multiplayer and in zombies. Like it's all soooooo bad and cheesy! Nothing about this game deserves recognition and that comes from a long time fan. This turd sits right next to advanced warfare to me, and to a lesser degree CoD Ghosts which was bad but at least had a fun invasion mode.

A few this past/current gen...

Dragon Age Inquisition. Got it because of the good reviews and its easily the one I dislike most of the franchise. Both the story and the whole character cast are terribly boring.

Divinity, Original Sin. Pretty much the same as above. I got bored real fast and I usually like strategic rpgs.

SFoxZero, Lord of Shadows 2, Lair - For obvious reasons.

I just remembered, I bought Street Fighter V disc and digital on PS4.... -____- and again on PC.

I paid full price for it both times on PS4. I paid 30 dollars for the season 1 pass+game on PC. I never play the PS4 version anymore....

I remember buying Starfox: Zero at full price. Returned that piece of garbage 5 days later...

Sniper Elite V3 on Xbone and Watch Dogs on Xbone, because they are garbage.

SOCOM 4 on PS3, one of the most disappointing games ever for me personally.

Test Drive 6 on Dreamcast. Shenmue on Dreamcast. Marvel vs Capcom 2 on Dreamcast, which cost more because I imported. All garbage.

I am going to cry.