I just played this mod with a friend a few days ago, and it's pretty fun!
It's a multiplayer level where one person plays as Madeline who can dash, and the other plays as Theo who has a grappling hook ability. You help each other through screens, for example by moving blocks or pressing buttons.
It's online, so there's a bit of delay, but it works better than I expected! The different abilities for Madeline and Theo make the gameplay a lot more interesting than if it was just 2 Madelines. I recommend checking it out, even if just to see what it's like.
GameBanana: https://gamebanana.com/mods/457818
Also, here's some other multiplayer mods if you didn't see them before.
Head 2 Head (Racing)
Madhunt (Hide and seek tag)
