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The game supports seamless drop-in/drop-out co-op for up to four players. You can manage sessions through the in-game menu:

: Higher quality weapons (indicated by stars) deal significantly more damage and have better reliability. generation-zero-game-link

If you are just starting out with a group, keep these strategies in mind from the Generation Zero Survival Guide : The game supports seamless drop-in/drop-out co-op for up