I really like phogs. It isn't quite split-screen, but you can play it together in couch co-op.

Duck Game! The downloadable internet levels are bizarre and creative. It's so much chaotic fun.

A lot of great games mentioned so far. I’d like to add Streets of Rogue to the list. It’s a lot fun playing it together. Especially when things don’t exactly go to plan :)

if you want some chaos; unrailed, overcooked, and plateup are good

Conflict Desert Storm, fun 4 player coop tactical third person shooter.

Diablo

Really enjoyed “Heave Ho!” Co-op 2D arcade-style game where you play a character with two arms, can control the direction and grabbing of each arm, and must cooperate to climb/heave each other through obstacle course levels. Couch co-op, best with controllers.

KeyWe is the newest one I've played with my wife. It's a game where you both play kiwis operating a relay station that has some quirks of its own.

Other games I would suggest:

• Overcooked
• Catastronauts
• Moving Out
• Lovers in a Dangerous Spacetime
• Helldivers
• Gauntlet
• Magicka
• Age of Wonders III (in hotseat mode)

If you like beat 'em ups:

• Streets of Rage 4
• Teenage Mutant Ninja Turtles: Shredder's Revenge
• Scott Pilgrim vs The World
• Mother Russia Bleeds

I'm not sure if it has split-screen or split-screen mods but check out Dinkum too.

Blur, the racing game from 2010. It's like Mario kart but with realism. It's abandonware now, you'll have to pick it up from an abandonware website...

But it's REALLY FUN.

The gears of war franchise has the most underrated coop campaigns in my opinion. They're among my favorite games for coop. Also splinter cell: double agent, although a bit dated at this point is still super fun.

We always keep an eye out for Switch games for this exact reason. Our favorites from there are Animal Crossing and Luigi’s Mansion.

My girlfriend and I both have computers (i built her a gaming PC so she could move off her laptop). The games we have enjoyed are Halo (no local co-op), Overcooked 2 (local co-op available), The Escapsists 2 (local co-op available), and "Keep talking and nobody explodes" (only 1 person needs the computer other is reading material helping them). Games we play together with co-op but we need to be on our own rigs are Apex legends (if we can call that Co-op), Starship troopers Extermination, Deep Rock Galactic, Left 4 dead 2, Satisfactory, The forest, Terraria, and Call of Duty BO3 custom zombies.

Honorable Mention: Old School Runescape. I grew up playing this game, played it again in college and got my girlfriend into it as well and now we both play often. It can be played on PC or even has a very well made mobile client that lets you play the same game on mobile. (be careful, the joke is that the game is called Run-Escape, since it tends to pull you in like a crack addiction lol)

The Goose Game, Bro Force, Diablo 3/4, Don't Starve, Moon Hunters. Just for a short list, I got more!

The goose game and moon hunters are easily two favorites. Peace was never an option.

Diablo 3.

Rocket league is a great split screen game!