Christmas Cat

It is time to set up the Christmas tree you think and so you go to the market and buy 20 Christmas balls for the decoration purpose. You already have the other decorative items in the house. After coming back home you happily put up the balls on the Christmas tree and go inside to fetch other items but just then a black cat comes and makes a mess of the tree scattering all the balls across the house. Now this can ruin your Christmas and you will not let that happen. You must go around trying to find all the 20 balls.