Aztec Gold

On the game field, there is a stone door made up of 16 blocks. These blocks hold colored crystals and rings. The quantity of crystals for each color is always the same as the number of rings of that color. Your task is to align the crystals with the matching color rings. To shift the crystals, tap the center of a set of four blocks on the screen. This will cause the four crystals on those blocks to rotate clockwise to their next positions. Continue this process until all 16 colored crystals are aligned within the rings of the corresponding color. Plan each move wisely.