One of the most realistic games you can play. When it comes to gameplay, 95% of the time, it follows real life logic.
I liked Endgame:Singularity by EvilMrHenry, which was ahead of its time.

Breakout 71
Osu! https://osu.ppy.sh/
Very good rhythm game, switched to it from Geometry Dash.
since no one's mentioned them:
- Oolite
- Dungeon Crawl Stone Soup
I love DC:SS.

It is like a refined nethack

Been a while since I played one, but Stunt Rally was/is really good. It kinda blew me away with how many tracks there were, and how fun they were, for a game I've never seen mentioned anywhere. Red Eclipse is cool too; like that they have an easy to use in-game level editor (with multiplayer!).
Battle for Wesnoth. It's a fantasy-themed turn-based strategy.
Though I haven't played it recently, I have some very good memories. It teaches you gambling and probability (especially on small multiplayer maps), and you develop feeling for the difference between 40% chance to hit and 30%.
The single-player campaigns are nice too. The one that I have in especially good memory is "Under The Burning Suns", which made a few creative and artistic changes to the game. It shouldn't be the first campaign you play, but it can be the second.
Oh man, this brings back memories. Used to play it in multiplayer with a couple of friends a lot at some point. Very well crafted, balanced game. The graphics are beautiful.
I still think about garak and under the burning suns from time to time. The plot is decent and while there's not much writing, what's there is generally good. I'd rate it better than the vast majority of games, but general consensus would probably place it below planescape torment and disco elysium. I really liked it.
Recently, battle for wesnoth has remade the delfador campaign and heir to the throne and tried to unify a bunch of the mainline campaigns together. Deceiver's gambit and the new httt are imo respectively second and third best wesnoth campaigns now.
Thank you for this! I played it long ago when I used Ubuntu but couldn't remember the name when I wanted to play it again!
I still think about garak and under the burning suns from time to time. The plot is decent and while there's not much writing, what's there is generally good. I'd rate it better than the vast majority of games, but general consensus would probably place it below planescape torment and disco elysium. I really liked it.
Recently, battle for wesnoth has remade the delfador campaign and heir to the throne and tried to unify a bunch of the mainline campaigns together. Deceiver's gambit and the new httt are imo respectively second and third best wesnoth campaigns now.
Oh now you make me want to play planescape torment again. Really good writing. It always felt like the dialogs were about you and the questions you have, and immediately relevant to what happens next in the game.
I'm maybe a third through disco elysium, but I found the writing went off-rails too often for my taste, sometimes disconnected with your quest or what happens next. It's still very well written, maybe just not my "book". But now I have just derailed this thread from the original topic completely, so who am I to judge.
I'm not very good at it, but NetHack catches me every now and then.
Beyond All Reason or Xonotic.
Xonotic is so fast and smooth.
BAR is the greatest RTS.
I don't see this one mentioned often, but Frogatto & Friends is a lot of fun if you like platformers with an old-school aesthetic. I keep it on my Steamdeck to play a few levels every now and then, it's a smooth game with a nice feeling to the controls.

The source is here.
Holy shit, I played Frogatto YEARS ago and totally forgot about it. Thank you!
Adding OpenRCT2, but I think most anyone who knows of OpenTTD knows of that.
Space Station 14 for me.
Not sure if it's my favorite, but openttd was already mentioned.
Mineclonia has like 95% of the features of Minecraft but is way better because you don't need a Microsoft account, plus modding is easier.
Also awesome:
- Pingus - Puzzle game with mechanics similar to Lemmings
- Dr. Robotnik’s Ring Racers - Kart racing game based on Sonic Robo Blast 2 (SRB2), itself based on a modified version of Doom Legacy
- The Powder Toy - 2D physics sandbox game
From the Luanti/Minetest games, I also like Exile very much.
It is a bit hard and nerdy (you'll have to read the PDF guide/tutorial as you progress), but I found it oddly calming. I recommend single-player only.
In contrast to other Luanti/Minecraft-Like games, in Exile it feels very rewarding just to have found shelter from a storm and a cozy fire going, after you were on the edge of collapsing from exhaustion. Though you're almost certainly out of food and it would be dangerous to go out looking before the storm passes, you're not quite dying yet and you have time to make your mud hole a bit more cozy. (It's not a good game if you want to build huge creative castles, but you'll need to build and improve your home a bit.)
Shattered Pixel Dungeon. The dev is even active on Lemmy! !pixeldungeon@lemmy.world
Came here to say exactly this. Played it for years and it keeps getting better and better. It's based on a game called Pixel Dungeon, which the original developer open sourced when they got bored with it. There are several other forks of PD, and I've also played most of them too, and SPD is definitely the best, and possibly the only one still in development.
beyond all reason
People have already said a couple of my favorites ( Super Tux Kart and Mindustry ), but I'd like to bring up one almost nobody talks about: Me And My Shadow
It's a 2D puzzle platformer where you control one person normally but then press space to record movement for your shadow character. Last time I tried downloading and playing it on Linux using the appimage on Sourceforge, pretty sure it didn't work because it might need an old glibc that has features that might not exist in newer versions.
This post reminded me of the game, so I'll download and see if I can run it on my desktop. Really feel like playing it now.
Edit:
I am too dumb to figure out how to make it work. Best I get is nothing. Not even a pop-up saying I need something else to make it work. So, I guess plating the windows release through WINE is the best I'd be able to do.
I played hundreds and hundreds of hours of Tremulous back in the day, and at least a few of its successor Unvanquished -- before mostly falling out of playing online games.
Isn't Doom open source now? Does that count?
It is and it does.
Endless Sky if you’re down for a top-down space shooter mining grind.
I still play 0AD every now and then
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