Shared waves, separate loadouts
In co-op, the wave pressure rises with each player, but everyone builds their own loadout from the shop. Coordinating tags across the group beats four copies of one build.
A group with split tags covers more threats. A group that duplicates one tag is strong against one thing and weak against the rest.
Revives and spacing
When a teammate falls, another can revive them. Keep at least one player mobile so the group does not collapse on the same spot.
Spread out to split enemy attention. A clustered group feeds one bomb into everyone at once.
Communication beats raw power
Call out which tag each player is building so the shop picks cover gaps. A coordinated group clears wave 20 with loadouts none could have built alone.
In co-op the wave scales with the group, so coordination matters more than individual power. Agree on tags before the first shop so the group covers melee, ranged, and area damage between them.
Revive quickly, but never at the cost of the whole group falling in one spot. A coordinated run clears wave 20 with loadouts none of the players could have built alone. Spread out to split enemy attention, and call out the shop picks that cover gaps.
Split the tags across the group so every threat has an answer. A coordinated shop covers what any single build misses. Communication turns four mediocre loadouts into one complete team.
Where to go next
Read best builds and synergies for tag planning. Then see stats explained for the stats each role should cover.