I hate Epic launcher but if you can get weekly free games from epic store.

Roguelikes:

• Dungeon Crawl: Stone Soup (http://crawl.akrasiac.org:8080/)
• DRL (https://drl.chaosforge.org/)

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Bit of a different genre, but I’ll throw HoloCure in here.

League of Legends runs pretty well.

And super smash bros melee via project slippi at slippi.gg

You could use system requirements lab website to see what games you can play with your specific computer. Instead of knowing what games you want to play but don’t know if they will work you will instead have a list of games you know will likely work and can pick from those.

You can practically run everything that was launched before 2012~.

guild wars 2, war thunder, world of tanks, team fortress 2, CSGO, random free MMORPGs (you can filter them on steam).

Minetest is a decent MC clone, open source and whatnot. There’s also a few mods out there that tries to replicate it. (inb4 someone says minetest is an engine and not a game)

any quake games at this point. (not QC), warfork is just Quake with more crazier movement.

Duelyst II is a fan revival of essentially a Hearthstone clone played on a chess board. It’s still in it’s early stages, but it’s fun and promising.

Muck is a roguelike survival. It’s got kind of a silly TWAB vibe. It’s fun to play with friends but you don’t have to.

TF2 is a casual FPS, as you probably know. It still holds up. I’d recommend playing on custom servers.

Emu🦢lation.

Guild Wars 2, has free to play tier, and no monthly sub if you buy. Definitely a dank game and I ran it for years and years on a piece of SHIT laptop from 2013-2014

Great roguelike “Shattered Pixel Dungeon”

This is a free (as in freedom) game, I’ve done dozens of runs, there was enough depth and graphics are pixel art. Available for computers, phones, whatever

I also have this problem so I’ll suggest some games I like to play. They’re not free unless you’re up for piracy.

Disco elysium (visual novel esque, unique and interesting, multiple choices, indie) - incredibly well written game with lots of dialogue and heavy political themes

Morrowind (open world, RPG, multiple choices, retro I guess) - oldest elder Scrolls game but maybe the best in terms of lore and freedom in game mechanics

Oblivion - same as morrowind but imo not as good

Factorio (indie) - if you like this kind of game you’ll never need another game suggestion because you’ll be too busy playing fsctorio

Rimworld (indie) - as addictive as factorio

There’s a lot of great suggests already here, but I’ll try to list off a few not mentioned (or mentioned less at least).

Super Tux Kart - open source racing game

Minetest - open source Minecraft style game

Emulators - always fun to play the classics

Android Games - through Waydroid (Linux), Google Play Games Beta (Windows), and Natively on some Chromebooks you can play Android games on a PC

DokiDoki literature club - a phsycological horror parody of visual novels

Unciv - Catan like open source strategy game

Dominaton - Risk like open source strategy game

Also, I would highly recommend against pirated games. Putting aside copyright debates, the idea of running some unknown executables on my device uploaded by an anonymous software pirate sends shivers up my spine. If you were really dead set on doing so, at least run them in a VM with nothing important on it.

I would suggest giving a look at Crosscode, Katana Zero and Hotline Miami 1 and 2. They are some of my favorite games. Katana Zero and the Hotline Miamis are shorter, story focused games, while crosscode is longer, with side quests and puzzles.