In the Mayan Mask game you need to destroy the masks as they slowly move up the screen. When they hit the top, you lose.
In order for you to break some of the blocks you need to click on two or more adjacent blocks of the same colour. In the Mayan Mask game you need to click twice to get them removed. The first click will highlight the adjacent blocks of the same colour. On the second click they will then explode.
There are some special blocks in the Mayan Mask game as well and these are really helpful in keeping the blocks from hitting the roof.