Same problem as with Petersen. Spent extra money to keep trying to clear this level,but filling all the squares with cheese did not complete the game. Obviously there are only 35 squares on the screen to fill, not 36. Keep getting a flashing green check mark in the upper right hand corner of the screen.
Level 881 (playing via Facebook on laptop) seems impossible though. It requires you to spread cheese over 36 squares, but there are only 35 squares in the game. I can cover 35 squares with a move to spare, but even when I use a crown on this last move there is no 36th tile to cover and so I lose.