Once again, your mission is to remove a cluster of same coloured
blocks, at least three, but the more the better. As soon as these
blocks have vanished, the blocks above of them will fall down and
filling the gap. While you remove blocks in the level, the game pumps
new rows from the bottom in. So you must remove them faster as new
rows appear and the blocks stacking up. Once all rows are in the game,
you win. If one block reaches the top, you loose. (Wikipedia)
