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, and Expedition, as any Slugcat. It is possible to play online via Steam Remote Play, but only one keyboard can be used.

Karma gates and s can only be activated when all living Slugcats are present.

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
Players can individually choose their Slugcat, color and size (pup or adult). Color mode has three options: Vanilla, Auto and Custom. Custom works the same as in 'Custom Color' options in Story mode. Size does not affect players' damage or ability to carry other Slugcats.

Difficulty
There are three difficulty settings; on Hard, all Slugcats must survive and hibernate for a successful cycle; on Normal, players' dead bodies must be carried to the shelter; on Easy, only one player needs to survive and hibernate.

On Hard and Normal modes, the Game Over screen does not trigger upon a player's death or corpse's destruction, however there is no way to complete the cycle save for visiting an.

Spears Hit/Miss
This setting affects all types of friendly fire, except s. When toggled off, 's slam and 's stun and maul do not affect other players.

Friendly Lizards
This setting affects whether tamed are friendly towards all players.

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, any Slugcat entering a pipe waits until the last player enters the room transition.

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 an extremely 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.