Knock Down Barns is a game of physical and mental skill created by Greg Burhop and marketed by Emerald Den Games. During the game, players take turns flicking a small foam marshmallow at a wooden structure (a "barn") erected by their opponent. The game is won by knocking the pieces of an opponent's barn off the board before the same can be done to one's own structure. The physical layout of the game comprises a handcrafted bamboo board, building materials made of reclaimed barn wood, "weapons" made of white foam, and a burlap sack in which the entirety of the game is stored.