Tzolkin

The Mayan's hidden secret is revealed. The mechanism has 20 levels. Each level has 13 speeds. At the end of each level you will release a hidden symbol. Your goal is to release all the 20 symbols. Combine pieces of the same color in squares of 4 or in rectangles of 6 pieces. Because the mechanism is based on the laws of physics, you can only move the pieces that are on top of each column. The pieces must not reach the top of the screen.