Two questions:
(1) Touch it as follows: Pull out four balls of various colors, so that at least eight of the remaining balls have the same color. (2) Most balls touched: 4×3= 12 (pieces) (3) This problem should be remembered from the most unfavorable factor, that is, the remaining balls are all of the same color, so we only need to touch a ball of different color, and that's all. (4) There are at most 12 red balls in the question, and there are 8 red balls left. The other four were moved. (5) Touch four of the other two colors.