Originally Posted by Maka
Better When Shared - 5
Complete a level as part of a four-player team. This also unlocks a tile on the Inner Board.
Just gather 4 total players, and start a new game. I suggest just completing Millfields, and choosing the right hand path at the end to make it go more quickly. You can also do this with 4 controllers, although it may be cumbersome by yourself that way.
I did this locally with 4 controllers doing the "Chicken Kicker" mini game. All I did was dodge the chickens as the NPCs took the hits.