THE SHORT ANSWER

Aniimo lists online co-op and PvP. Egg Heist is described as a three-player-team mode, while Xbox separately lists online co-op for 2–4 players. Party sizes depend on the mode you choose.

The multiplayer modes we know about

Egg Heist is described as PvEvP, combining the environment with encounters against other players. Check the player limit for the activity you want to join.

Mode / listingPublished information
Online co-opSupported according to Steam; Xbox lists 2–4 players
Online PvPListed on Steam
Egg HeistThree-player teams searching and battling in the Lost Isles

Planning a session with friends

Check that everyone’s platform has launched in their region. Mobile has a later announced release than PC and consoles, so mixed-device groups should account for that timing.

When you start playing, follow the in-game invitation prompts and check each activity’s unlock requirements and reward rules.

Compare platform release dates

Can friends on other devices join?

Cross-platform multiplayer is advertised, and the FunPlus interview discusses PC, console and mobile players playing together. Cross-save, shared purchases and cross-region matchmaking are separate capabilities.

Read the crossplay guide
SOURCES & FURTHER READING

Based on the official information and attributed reporting below. Store availability and launch details may change.