You build the API which implements a move handler, and every turn of the game the Battlesnake engine calls your move API with the full board state information a

You build the API which implements a move handler, and every turn of the game the Battlesnake engine calls your move API with the full board state information and your API returns a move (up down left or right). https://docs.battlesnake.com/references/api https://docs.battlesnake.com/references/api