For NES:

Bad Dudes (The president has been kidnapped by ninjas. Are you a bad enough dude to rescue the president?)
Battletoads
Battletoads and Double Dragon
Bubble Bobble
Double Dragon 2
Double Dragon 3
Gauntlet
Gauntlet 2
Ice Climbers
Nightmare on Elm Street (kinda crappy, but has up to 4 player co-op platforming on one screen)
Ninja Crusaders (think like 2 player Ninja Gaiden)
Nintendo World Cup (great Technos soccer)
River City Ransom (this is the one you want, this is the one you want!)
Shadow of the Ninja (think like 2 player Ninja Gaiden)
Snake Rattle 'n' Roll
Super Dodge Ball (great Technos dodge ball)
Super Spike V'Ball (great Technos v'ball)
TMNT 2: The Arcade Game
TMNT 3: The Manhanttan Project

For Genesis:

Contra Hard Corp.
Gauntlet 4
Golden Axe
Golden Axe II
Gunstar Heroes (I can't believe I forgot this, it's so damn sick)
Sonic 2 (it's like 1 and a half players, and 2 players for the bonus rounds, I guess you could trade off Sonic? hey it was fun when I was like 8 or so)
Streets of Rage 2 (great beat 'em up with amazing soundtrack)
Toejam and Earl

For SNES:

Battletoads and Double Dragon
Firepower 2000
Final Fantasy 3, aka 6 (2p from the beginning, you each control a couple characters during battles, and you can change at any time, great classic RPG with great soundtrack, in case you have a really long drive)
Kirby Superstar
Legend of the Mystical Ninja (platforming action with towns in between stages to buy items and train and learn info, hilarious plot)
Secret of Evermore
Secret of Mana (2p adventure/RPG after you find the 2nd character)
Seiken Densetsu III (Secret of Mana 2)
Soldiers of Fortune
Sunset Riders
Super Battletoads
Super Double Dragon (if you have a short drive, this whole game's like an hour and really fun)
TMNT: Turtles in Time
Troddlers (2p co-op puzzler)
Zombies Ate My Neighbors (super sweet amazing classic top-down shooter with assloads of enemies, items, weapons, and zings, full of classic movie monsters and then some, highly recommended)


For N64:

Goemon's Great Adventure (same as Legend of the Mystical Ninja)
Mario Tennis
Perfect Dark (try all the challenges, I dare you)





Try to keep this list only co-op games and not competitive games. Feel free to keep updating it! This list is becoming super awesome. Feel free to add short descriptions of gameplay in parentheses after any of them too. I'm too lazy to add in the TG16 stuff right now.

Words Of Wisdom said: masschamber said: Genesis,, only things I haven't seen mentioned Contra Hard Corp, play the Japanese release unless you wish to suffer greatly That makes no sense at all.

Japanese version you get 3 hits perlife and there are extra life codes,

the US release you get 1 hit, 3 lives, 3 continues,

Japanese release is really hard, but the US one is insane

The Ghost of RubangB said: Try to keep this list only co-op games and not competitive games. Feel free to keep updating it! This list is becoming super awesome. Feel free to add short descriptions of gameplay in parentheses after any of them too. I'm too lazy to add in the TG16 stuff right now.

I'll fill in some Turbo Grafx 16 games,

parasol stars (a third bubble bobble game really good too)

Chew Man fu, fun little puzzle action game

Cadash, action rpg, better than genesis one

Bonk 3, this one as 2 player co-op 

 

For NES:

Bad Dudes (The president has been kidnapped by ninjas. Are you a bad enough dude to rescue the president?)
Battletoads
Battletoads and Double Dragon
Bubble Bobble
Double Dragon 2
Double Dragon 3
Gauntlet
Gauntlet 2
Ice Climbers
Nightmare on Elm Street (kinda crappy, but has up to 4 player co-op platforming on one screen)
Ninja Crusaders (think like 2 player Ninja Gaiden)
Nintendo World Cup (great Technos soccer)
River City Ransom (this is the one you want, this is the one you want!)
Shadow of the Ninja (think like 2 player Ninja Gaiden)
Snake Rattle 'n' Roll
Super Dodge Ball (great Technos dodge ball)
Super Spike V'Ball (great Technos v'ball)
TMNT 2: The Arcade Game
TMNT 3: The Manhanttan Project

For TurboGrafx-16:

Bonk 3
Cadash (action RPG, better than Genesis one)
Chew Man Fu (fun little puzzle action game)
Parasol Stars (a third Bubble Bobble game, really good too)

For Genesis:

Bonanza Bros.
Contra Hard Corp.
Gauntlet 4
Golden Axe
Golden Axe II
Gunstar Heroes (I can't believe I forgot this, it's so damn sick)
Sonic 2 (it's like 1 and a half players, and 2 players for the bonus rounds, I guess you could trade off Sonic? hey it was fun when I was like 8 or so)
Streets of Rage 2 (great beat 'em up with amazing soundtrack)
Toejam and Earl
Toejam and Earl: Panic on Funkatron

For SNES:

Battletoads and Double Dragon
Firepower 2000
Final Fantasy 3, aka 6 (2p from the beginning, you each control a couple characters during battles, and you can change at any time, great classic RPG with great soundtrack, in case you have a really long drive)
Kirby Superstar
Legend of the Mystical Ninja (platforming action with towns in between stages to buy items and train and learn info, hilarious plot)
Secret of Evermore
Secret of Mana (2p adventure/RPG after you find the 2nd character)
Seiken Densetsu III (Secret of Mana 2)
Soldiers of Fortune
Sunset Riders
Super Battletoads
Super Double Dragon (if you have a short drive, this whole game's like an hour and really fun)
TMNT: Turtles in Time
Troddlers (2p co-op puzzler)
Zombies Ate My Neighbors (super sweet amazing classic top-down shooter with assloads of enemies, items, weapons, and zings, full of classic movie monsters and then some, highly recommended)


For N64:

Goemon's Great Adventure (same as Legend of the Mystical Ninja)
Mario Tennis
Perfect Dark (try all the challenges, I dare you)





Try to keep this list only co-op games and not competitive games. Feel free to keep updating it! This list is becoming super awesome. Feel free to add short descriptions of gameplay in parentheses after any of them too.

Ok I got carried away and started a new thread for this. Let's rock every system ever.

http://vgchartz.com/forum/thread.php?id=19608

masschamber said: Words Of Wisdom said: masschamber said: Genesis,, only things I haven't seen mentioned Contra Hard Corp, play the Japanese release unless you wish to suffer greatly That makes no sense at all. Japanese version you get 3 hits perlife and there are extra life codes, the US release you get 1 hit, 3 lives, 3 continues, Japanese release is really hard, but the US one is insane

It's not that hard.  I own it for the Genesis and have beaten it.  As long as you pick the robot or the girl it's actually really easy.

Words Of Wisdom said: masschamber said: Words Of Wisdom said: masschamber said: Genesis,, only things I haven't seen mentioned Contra Hard Corp, play the Japanese release unless you wish to suffer greatly That makes no sense at all. Japanese version you get 3 hits perlife and there are extra life codes, the US release you get 1 hit, 3 lives, 3 continues, Japanese release is really hard, but the US one is insane It's not that hard. I own it for the Genesis and have beaten it. As long as you pick the robot or the girl it's actually really easy.

 So I can one life Nam'75, Metal Slug 1,x and 3 on expert, and one life Contra 1...serveral times, doesn't mean it's actually really easy, trying to look at this from the perspective of someone that hasn't masterred the game

masschamber said: Words Of Wisdom said: masschamber said: Words Of Wisdom said: masschamber said: Genesis,, only things I haven't seen mentioned Contra Hard Corp, play the Japanese release unless you wish to suffer greatly That makes no sense at all. Japanese version you get 3 hits perlife and there are extra life codes, the US release you get 1 hit, 3 lives, 3 continues, Japanese release is really hard, but the US one is insane It's not that hard. I own it for the Genesis and have beaten it. As long as you pick the robot or the girl it's actually really easy. So I can one life Nam'75, Metal Slug 1,x and 3 on expert, and one life Contra 1...serveral times, doesn't mean it's actually really easy, trying to look at this from the perspective of someone that hasn't masterred the game

Sorry, I lost that perspective a long time ago. ^_^

Words Of Wisdom said: masschamber said: Words Of Wisdom said: masschamber said: Words Of Wisdom said: masschamber said: Genesis,, only things I haven't seen mentioned Contra Hard Corp, play the Japanese release unless you wish to suffer greatly That makes no sense at all. Japanese version you get 3 hits perlife and there are extra life codes, the US release you get 1 hit, 3 lives, 3 continues, Japanese release is really hard, but the US one is insane It's not that hard. I own it for the Genesis and have beaten it. As long as you pick the robot or the girl it's actually really easy. So I can one life Nam'75, Metal Slug 1,x and 3 on expert, and one life Contra 1...serveral times, doesn't mean it's actually really easy, trying to look at this from the perspective of someone that hasn't masterred the game Sorry, I lost that perspective a long time ago. ^_^

 Completely reasonable obviously, always great when a traditionally hard game becomes easy