Co-op in Noita is a different game. More hands means more reactions you did not start.
Threat scales
Enemies get harder, but you also clear faster. The net effect is a run that rewards coordination and punishes stacking.
Bring a real wand
A wand that chains without locking up pulls weight. A glass cannon that needs a friend to cover it is a liability. Come with flasks and a wand you trust.
The wipe pattern
Two players in one hazard die in one chain. Stand apart. Watch where your friend’s spells go before you step into them. Friendly fire is the main co-op killer.
Share the load
Heal each other by covering retreats. One player kites while the other fires from safety. A co-op run that fights as a line beats one that clumps in a room.
The combat guide covers positioning that works solo or together. The habits transfer directly.
Split the roles
In co-op, one player scouts while the other fights, and you revive a downed partner by standing close until the bar fills. Because wands are shared resources, agree on spell choices before someone slots a spell that drains the whole pool.