Blur

Not forgotten or obscure but... Assassin's creed 3. Yeah the main character sucks but I love the missions and map. Also has just the right amount of pirate like missions (in 4 is too much). I don't understand why people loved 4 so much the story of that game sucks lol and the villains are so forgettable.

Blast Corp 64

Metal Arms: A Glitch in the System

Sentinel... From waaay back. Like, Commodore 64 age. I think it would be a perfect VR game, too.

Empire earth

Sigma Star Saga for the GBA. Really creative mashup of an RPG and a side-scrolling shooter, with a cool weapon-configuration system thrown in. Definitely suffered a bit from platform limitations, but there's absolutely more that could have been done with the core concept.

Shockingly good writing, too.

Drakan series needs reboot. I played Drakan; Ancient gates. That game was so much fun. The seamless transition from fighting on a dragon to fighting on your feet. The next level spell casting where you had to trace out the symbol to cast. The lore felt really deep like there was a lot of secrets they never fleshed out and ever since I’ve had an itch that never got scratched.

Streets of Rage, even if it's just for the music

The original GTA, it somehow has the atmosphere of 80s/90s that only Více City could kind of replicate (and multiplayer was fun)

Absolver. It was the precursor to Sifu, but with slightly slower and more methodical combat (more like a Soulslike, almost).

The coolest part of it is, as you play and fight players and NPCs, your character will slowly learn and unlock the moves that are used against them, which you can then put into your moveset and chain together with other moves to create your own style. If you don't want to do that, you can join a player-run school, and be given the fighting style of that school's master, which your character will learn as they use it.

The story mode is pretty short. It's mainly about PvP (although, before development stopped, it DID get a free DLC with a co-op dungeon run that's worth killing a couple of hours on). Of course, a PvP-focused game with nobody playing it isn't exactly the most entertaining thing to spend your time on, so- outside of a small collection of diehards- it pretty much stays a ghost town.

It had heart, it had ambition, and it had creativity. My friends and I were really hoping the success of Sifu would mean people might start going back and maybe breathing a little life into it, but that didn't happen. We hoped maybe they'd announce a second one, but that hasn't happened yet, either. It'll probably just be another Sifu. That one was a proven success, so it makes more sense.

The servers are still up for now. No idea how much longer it'll be supported. But, if you've got friends you can play it with, it might be worth looking into and seeing for yourself what the game offered, and what could've been.

It's not underrated or forgotten, but LOTR two towers.

Recently replayed Yakuza & it very much held up

kenshi is the post-apocalyptic life/ant sim that I never knew I wanted. There is no story other than what is in your head, and that's beautiful.

theres a great little pvp wargame sim from the sega genesis era called 'Herzog Zwei'

it was perfect in its simplicity. deserves a reboot.

I want a modern Road Rash or Destruction Derby.

Lugaru and Overgrowth.

Giants: Citizen Kabuto

Yoku's Island Express. Before playing it, I didn't like pinball or search-action games (metroidvanias). I ended up loving it. I still don't really enjoy pinball on its own, but I now have a deep love for search-action.

Ogre Battle. I'd love to play a game like that again. I think Unicorn Overlord took some inspiration from it so I'm excited to check that out.

The original Way of the Samurai. It was really cool and unique little game. The sequels never really followed through on the best parts of the first one though unfortunately.

xracer - A WipeOut clone (would love some development on this)

https://packages.debian.org/sid/xracer

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Sauerbraten FPS (1990s fps distilled)

http://sauerbraten.org/

Below the Root for C64.

Fatal Racing

An old PS1 fighting game called Unholy War. It had a lot of really unique mechanics I haven't seen since.