Twin Blocks

As in usual tetris game, random figures fall on a rectangular well width of 8 and a height of 16 cells, with the sole difference that now well has a depth of 2 cells (two game planes). In flight, player can rotate the figure, moving it horizontally and to throw from one plane to another. Also, you can drop a figure that is accelerating its fall, when it decided to figure should fall. Figure flying, until it hits a different figure or on the bottom of the well. If horizontal row is filled with 8 cells on both planes - it disappears, and everything above it drops to 1 cell. Game speed is gradually increasing. The game ends when a new figure can't fit into the well. The player gets 100 points for each row disappearance, so the challenge - to fill the rows without filling the well itself as long as possible.