Imagine that you are looking into the drop-shaft from the top. You see four walls and the bottom. The flat 2d figures falling down from the walls one by one. You can move these figures from one wall to another or rotate them. If the figure leave the wall then it moves on the bottom while another figure is pushed. You need to form full rows and/or columns on the bottom. When you form such row, it disappear and you receive additional empty space on the bottom and points. The more rows you can fill at a time, the higher score you will have.
If you can't place the whole figure on the bottom, then it stays on the wall and this wall becomes frozen (you can't place figures on it) for a while. After enough rows have been successfully cleared, you will receive a bonus figure and go to to the next level - game speed will be increased. Your task is to play for as long as possible and gain more points.
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