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 Survivor and Monk must be unlocked by completing their respective campaigns. It is possible to play online via Steam Remote Play.

Player interactions

 * Slugcats have collision with each other.
 * A crouching Slugcat may be grabbed by any other player. Holding pick up transfers the Slugcat onto their back. The throw button throws the Slugcat in the direction held. A held Slugcat can jump out of the grasp at any time.
 * This interaction does not change between players' sizes.

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).

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. This is purely aesthetic and has no gameplay changes.

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. If a Slugcat's body is destroyed or lost, the cycle must be reset, either by killing the remaining Slugcats or visiting an.

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, so the only way to progress is to kill the remaining Slugcats or to visit an Echo.

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, and Gourmand and Artificer's special abilities do not trigger.

There are a few exceptions to friendly fire, most notably:
 * still hits players regardless of friendly fire being toggled on or off.
 * Projectiles fired by the hit players.
 * 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 players if thrown at close range.

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.

HUD
When toggled on, players' names are displayed above their Slugcat using their main color.

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.
 * has a larger lung volume.