Rivals of Aesther - like Super Smash Bros but with Steam Workshop support for player-made characters... TARS (interstellar) vs Ronald McDonald vs Obama anyone??
nidhogg - deserves to be in an arcade cabinet but honestly this one is ALWAYS a hit...just 2player though
Broforce - 80s action stars in 80s action movie multiplayer platformer
Ultimate Chicken Horse - competitively build a platformer level and then race to complete the level first, best with 4 players
TowerFall Ascension - 2-4 players, also deserves to be in an arcade cabinet
Screen Cheat - FPS made for the couch; think N64 Goldeneye or Quake, but all the players are invisible, so the only way to figure out where your opponents are is to look at their quadrants (screencheat)
Overcooked 2 - it's pretty kid-oriented on the surface, but it's a game where you must out-communicate the absolute chaos unfolding around you in order to succeed...such a good couch-multiplayer experience, but best for experienced gamers imho
Rocket League
Magicka
Regular Human Basketball - control giant basketball automatons by jumping inside them and operating the manual controls in a team v team. Minimum 4 players to really work well, supports up to 10 players shared screen
That should get you started! But oops that wasn't my casual coop list, more my "makes for memorable group experiences" list.
It Takes Two, Portal 2, Untitled Goose Game, Halo Master Chief Collection was like $10 recently, all come to mind as positive local coop experiences I've had.
nidhogg - deserves to be in an arcade cabinet but honestly this one is ALWAYS a hit...just 2player though
Broforce - 80s action stars in 80s action movie multiplayer platformer
Ultimate Chicken Horse - competitively build a platformer level and then race to complete the level first, best with 4 players
TowerFall Ascension - 2-4 players, also deserves to be in an arcade cabinet
Screen Cheat - FPS made for the couch; think N64 Goldeneye or Quake, but all the players are invisible, so the only way to figure out where your opponents are is to look at their quadrants (screencheat)
Overcooked 2 - it's pretty kid-oriented on the surface, but it's a game where you must out-communicate the absolute chaos unfolding around you in order to succeed...such a good couch-multiplayer experience, but best for experienced gamers imho
Rocket League
Magicka
Regular Human Basketball - control giant basketball automatons by jumping inside them and operating the manual controls in a team v team. Minimum 4 players to really work well, supports up to 10 players shared screen
That should get you started! But oops that wasn't my casual coop list, more my "makes for memorable group experiences" list.
It Takes Two, Portal 2, Untitled Goose Game, Halo Master Chief Collection was like $10 recently, all come to mind as positive local coop experiences I've had.