What are some great Party Games on PC? Meaning games you can play in up to 4 players on the same PC?

https://store.steampowered.com/curator/7189360-Couch-Gaming-%2528Local-Multiplayer%2529/

Stick Fight: The Game - One of the best I've played. It's really simple to pick up and play a few rounds.

https://store.steampowered.com/app/312530/Duck_Game/

https://store.steampowered.com/app/251470/TowerFall_Ascension/

https://store.steampowered.com/app/386940/Ultimate_Chicken_Horse/

https://store.steampowered.com/app/303590/Hidden_in_Plain_Sight/

Broforce - Great 2D platform CO-OP shooters, quite old from 2015 but should get a big update next year! - also has a free demo The Expendabros.
Crawl - Cool dungeon crawler where one player is a hero trying to fight through the dungeon whereas the others are monsters trying to kill him.
Cook, Serve, Delicious! series - simple cooking games, where you only click the needed buttons. It can get quite hard though.
Flat Heroes - quite simple but hard 2D arcade... fighter? Dunno what to call it.
Regular Human Basketball - two teams controlling big robot machines trying to score.
BattleBlock Theater - 2D platformer with a story and many game modes.
Horizon Chase Turbo - Arcade racing game that pays homage to old arcade machines.
Unrailed! - Very cool co-op/versus game where you try to quickly build a railroad for a slowly speeding up train.
Heave Ho - Nice "platformer" where you try to fight gravity and silly controls.
Guacamelee! 2 - 2D story-based metroidvania. Haven't played this one yet, but the first one was pretty good (but I think the first one doesn't support 4 players)
Jackbox Party Games, Use Your Words - Nice party games, but they are only usually funny when all players have the same sense of humor.
Stikbold! A Dodgeball Adventure - Dodgeball game with a simple story and some game modes.
I could probably name more, but I think that this is more than enough. Hopefully, you will find one that interests you.

Streets of fury EX, Wee tanks, Speedrunners, Lethal league (Blaze), Road Redemtion and move or die ... atleast they are tagged as local 4 player mode

The Jackbox games are a blast.

The Yawhg 1-4
Manual Samuel 1-2
Planet of the Apes: Last Frontier 1-4

Edit: There is also a RPG 1-5 game where players can use their smartphones as controllers, it's super cool but I can't remember its name.

To play with close friends
https://store.steampowered.com/app/469820/Genital_Jousting/

I really enjoy playing https://store.steampowered.com/app/787810/Rogue_Heroes_Ruins_of_Tasos/ with my girlfriend. Its also possible to play with 4 players.

Worms Armageddon
GRIP: Combat Racing
Lost Castle
Heroes of Might & Magic III

Apparently these have shard/split screen;

Spiderheck

Earth Defence Force 5

Tabletop Simulator

Golf With Your Friends

TMNT 2: Battle Nexus was a beast even with 4 players.

Jackbox party games are best when you have multiple people!! So fun!

These are all games I've personally played and enjoyed

Super Monkey Ball!
Riverbond
Nippon Marathon
Fighties
Boomerang Fu
Obliteracers
Disney Universe

I actually have a Steam collection just for this. Some others:
1) Assault Android Cactus+
2) F1 Race Stars
3) Hotshot Racing
4) Moving Out
5) Road Redemption
6) Insane 2
7) Nine Parchments
8) Hyperdrive Massacre
9) Hive Jump
10) Geometry Wars 3: Dimensions Evolved
11) HELLDIVERS Dive Harder Edition
12) BlazeRush
13) Gauntlet
14) Guacamelee Series

I checked all of these and they have Shared Splitscreen :)

• The Adventure Pals https://store.steampowered.com/app/396710/The_Adventure_Pals/
• Brawlout https://store.steampowered.com/app/263720/Brawlout/
• Fist-Fluffs https://store.steampowered.com/app/1407080/FistiFluffs/
• For the King https://store.steampowered.com/app/527230/For_The_King/
• Katamari Damacy https://store.steampowered.com/app/848350/Katamari_Damacy_REROLL/
• ROUNDS https://store.steampowered.com/app/1557740/ROUNDS/
• Out of Space https://store.steampowered.com/app/400080/Out_of_Space/
• Rivals of Aether https://store.steampowered.com/app/383980/Rivals_of_Aether/
• Nickelodeon Kart Racers 2 https://store.steampowered.com/app/1383960/Nickelodeon_Kart_Racers_2_Grand_Prix/
• Fling to the Finish https://store.steampowered.com/app/1054430/Fling_to_the_Finish
• Root https://store.steampowered.com/app/965580/Root/
• Tricky Towers https://store.steampowered.com/app/437920/Tricky_Towers/
• Ultimate Chicken Horse https://store.steampowered.com/app/386940/Ultimate_Chicken_Horse/
• Spirit Sphere DX https://store.steampowered.com/app/458170/SpiritSphere_DX/
• Any of the Monster Prom games https://store.steampowered.com/app/1140270/Monster_Prom_2_Monster_Camp/

https://store.steampowered.com/app/1732920/Bulanci

Original allowed multiple players play on same keyboard. Not sure how about remaster, but heard it is bad.

Been playing this recently: https://store.steampowered.com/app/943370/Bravery_and_Greed/

It might be up your alley :)

This is my go to...

https://jellyteam.itch.io/super-slime-arena

It can recognize nearly any controller, even the Dreamcast Fishing controller!

https://store.steampowered.com/app/1037910/Paw_Paw_Paw

Also, i havent played it, but i think overcooked, embr, out of space, tools up, and moving out should fit as well

Also support 4+ coop, but it is not like other party game (it is an escape room simulator): https://store.steampowered.com/app/1435790/Escape_Simulator

You could also throw in some scare tactic horror games and let 1 play in the dark. See who can stay alive the longest ><
But that is probably not what you are looking for.

And drawful 2 is pretty fun also.

Ultimate Chicken Horse and Drink More Glurp are top tier!

The Trine series is wonderful :)
I played 4 only but a friend of mine has 100% 1 and 2 because of how good they are.