This guide is in progress, I will be adding more info!

From the main menu, go to Remix and enable Jolly Co-op. Then, go to Story or Expedition mode and you will see a new button to select the players.

Make sure to check the in-game guide for more information! This can be accessed on the top-right corner of the Jolly menu.

• You only need one copy of the game and DLC
  
• You don't need any mods
  
• To play online you can use steam remote play or parsec
  
• The player limit is 4
  
• You can only play the three base campaigns for now (surv,monk,hunter), but you can chose any player you want (for example, survivor world, but artificer and saint)
  
• There are some secrets!

Jolly Coop mode is local. However, you can play with your friends online using Steam Remote Play.

Instantly share your Steam local multi-player games with friends over the internet, for free.
Using Remote Play Together, one player owns and runs the game, then up to four players — or even more with fast connections — can quickly join in the fun. More info here.

You have three options:

• Playing on Monk, Survivor or Hunter campaign, with MSC slugcats.
  
• Play Jolly+Expedition, but story elements will be disabled
  
• (not recommended) Enable the cheat to play the MSC campaigns with Jolly

This is the default option. Once you have unlocked MSC characters, you can select them in Jolly. For example, you can play in Hunter's world, but all players are playing with Saint. Or you can play in Monk's world, Player 1 is Artificer and Player 2 is Survivor. Combinations are endless!

You can play co-op in Expedition as well, with all the slugcats, even MSC. You will play in their worlds. However, the story elements will be disabled!

Disclaimer: expect crashes! This mode is not recommended and is unfinished. However, if you really want to have a taste you can create an place an empty .txt file called `garrito_feature.txt` inside the `Rain World\RainWorld_Data\StreamingAssets`. This will unlock Jolly Co-op in all the campaigns.

The original free mod still can be installed. However, it was made for an older Rain World version, so you have to downgrade your game. This can be done easily through Steam.

First, you need to switch to the v1.5 branch.
0) MAKE A BACK UP OF YOUR SAVES.
1) To switch to a custom branch in the Steam client, right-click on the game from the library page and select "Properties". Among the available tabs will be the "BETAS" tab.
2) Select v1.5
3) Let the game update.
Visit here to install the mod Jolly Co-op mod here[github.com]

Mind you this version is no longer maintained and it contains issues!

• While waiting inside a shortcut, press jump to cross immediately!
  
• You can throw piggyback players by holding a specific direction (for example, up) and pressing Throw! For example, you can jump and while the air throw your player from the back upwards by holding up!
  
• When playing with garrito_feature, try to carry Player 1 body even if they die on Easy mode.