Jolly Co-Op

Jolly Co-Op is a local multiplayer gamemode introduced in the Downpour DLC. It allows up to four players to play and explore, , and 's campaigns, as well as Expedition, as any Slugcat. Slugcats other than and  must be unlocked by completing their respective campaigns. It is possible to play online via Steam Remote Play.

Settings
Jolly Co-Op settings can be changed in its unique configuration menu toggled by the button in the top right of the Slugcat selection screen or Expedition mode. Slugcat selection is player-specific, while all other settings apply to the whole campaign.

Slugcat Selection
There are 4 settings that all players may choose to customize their experience:

Slugcat: Allows players to choose between whichever Slugcat they want to utilize during the playthrough. Multiple players may select the same Slugcat.

If Jolly Co-Op is enabled, but the number of players is set to 1, this allows the first player to play through Monk, Survivor, and Hunter's campaigns with any Slugcat.

Color: Allows players to customize their colors to better differentiate themselves from the other Slugcats, or just for aesthetics. This works identically to how custom colors work in single player campaigns.

Size: Allows players to toggle between adult mode and pup mode, as the name implies, playing in pup mode gives the player the physique and general ability of a. Playing as a Slugpup results in generally lower stats and inability to reach certain places on their own without being carried by an adult player.

Name: Allows players to insert a custom name, the defaults are 'Player 1', 'Player 2', 'Player 3', and 'Player 4'

Difficulty
Jolly Co-Op offers three different difficulty settings to better cater to individuals looking for a more casual or hardcore playthrough.

In Easy mode, only one of the current players needs to reach a shelter in order for the cycle to be considered successful.

In Normal mode, all players, alive or dead, need to reach a shelter in order for the cycle to be considered successful; this requires other players to carry dead Slugcats to the shelter.

In Hard mode, all players need to be alive and reach a shelter in order for the cycle to be considered successful. Even if a player dies, the game over prompt does not trigger, meaning that the only way to progress is for the rest of the living players to kill their own Slugcats, or to visit an, as this will reset the current cycle.

Spears Hit/Miss
This setting toggles friendly fire. When toggled on, s thrown by players have collision with other Slugcats and are able to kill them. In addition, 's slam and 's stun and maul will be able to affect other players. When toggled off, player thrown Spears phase through any other Slugcats as well as Gourmand and Artificer's special abilities not triggering.

There are a few exceptions to friendly fire, most notably:
 * still hits players regardless of friendly fire being toggled on or off.
 * s are always lethal to all players if thrown at close range (With the exception of ).
 * s are always lethal to all players in the radius of effect.


 * Saint can always Ascend players if max Karma has been reached.
 * s are always lethal to all players if thrown at close range (With the exception of ).

Friendly Stealing
This setting determines if players are able to take items from other Slugcats. If this is turned off, players are required to drop items to exchange them with each other.

Friendly Lizards
This setting affects whether tamed are friendly towards all players, or just the one that tamed it.

Camera Cycling
When toggled on, pressing the Map button twice will cycle the camera to the next player. Otherwise, players can only request the camera for themselves.

Pipe Interactions
When Vanilla Pipes is on, Slugcats proceed through room transitions as normal. Otherwise, if the Smart Pipes setting is toggled, any Slugcat entering a pipe waits for a short amount of time before going completely through it in order to give other players a chance to enter.

Food
Slugcats share the same food bar, determined by the current campaign. Any food can be consumed to add to the bar, regardless of whether the main Slugcat can eat it; however, individual Slugcats still have their own food limitations. For example, on a Expedition,  can consume Blue Fruit to add to the bar, but not Batflies. Meat-eating Slugcats are able to eat the corpses of creatures already leeched by Spearmaster, making it a convenient way to gain food.

Reputation
Each Slugcat has their own reputation counter and gain rate. For example, s are always hostile towards, even if Player 1 has Chieftain. However, upon payment, toll scavengers allow all present Slugcats to pass (except Artificer).

Bugs
Jolly Co-Op can cause the vanilla ending to not trigger properly, as the light teleports whenever Slugcat swims closer.

Trivia

 * Player Slugcat kills count as 1 point.
 * Player corpses cannot be eaten, but can gain 1 food by spearing a Slugcat.
 * Spearmaster's weight is adjusted so they cannot infinitely fly by backflipping with a.