Two players take turns putting in flour and the first person to get four in a row, whether up and down, side to side, or diagonal, wins the game. But you can't win because it's flour! Use the arrow keys (or WSAD) to move from side to side. Press the down arrow to drop chips. Press 'R' to reset the game.
Thanks to TheTrendyToad for the original and thanks to a connect flour image I saw.