What are some sick 16-bit Co-op games?

[masschamber]

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