I have almost 900 hours on The Talos Principle, a first person singleplayer puzzle game which I happen to speedrun (even though I don't really go for competitive times, I prefer routing / finding new exploits and optimizations). I also have the third fastest speedrun time for SUPERHOT in the world which I'm pretty proud of.
TheIdiotNinja's profile - Runs - speedrun.com
I'm also REALLY into Danganronpa and I enjoyed the Zero Escape games a ton even if I'm not as invested in them (good taste
HSOWA ). Other visual novels I played and loved are VA-11 Hall-A and Root Double.
I really enjoy other first person puzzle games in the style of The Talos Principle, Portal / Portal 2, etc. Some of my favorites are Antichamber, Quantum Conundrum, and TRI: Of Friendship and Madness.
I've had my fair share of hundreds of hours dumped on Hearthstone and League of Legends, reaching Legend in Hearthstone (though I focused on Arena where I averaged 6.5 wins at some point) and reaching Diamond in League in Season 5 (I know, I know, not impossibly great achievements, but they still take time to get). Don't play either game anymore.
I can dig roguelikes from time to time. Rogue Legacy and Risk of Rain were fun.
Had my fun with Super Meat Boy a few years ago, tried to get back into the 2D platformers with Dustforce recently but good lord these games are difficult for my untrained fingers.
Always been a huge fan of the first three Paper Mario games as well as most Mario & Luigi games, but recently I feel like the quality of both dropped off a ton (well, Paper Mario was terrible after SPM, M&L was a slow descent). Love both Galaxy games to death, enjoy the Mario Karts a ton too.
The Inazuma Eleven games for DS/3DS were, for some reason, incredibly addictive. Spent hours compiling spreadsheets about statistics and whatnot, do not regret a single second.
Professor Layton games were a pretty big part of my childhood and I love them to death. Ace Attorney games I caught up on more recently, also a big fan.
Fire Emblem Awakening was very fun. Couldn't really get into the older ones though, and haven't tried Fates. (I know all of the diehard fire emblem fans will think lowly of me for this, but hey, to each their own? I'm not saying the other ones are bad, just not my thing.)
Bravely Default was a lot of fun. Bravely Second is sitting on my shelf waiting for when I can be bothered to actually play it, alongside Yokai Watch.
Sometimes I mess around with trying to clear Minesweeper as fast as possible but I'm nowhere near professional. Can most likely do it better than your average person though.
This is probably a nice comprehensive list of all the videogames I've enjoyed a lot in the past or present. Don't think I'm missing too much.