The bricks get down automatically at a slow speed at the beginning (1st level). At each level, the speed increases, which seriously complicates the situation. You can move each brick by using the keyboard cursors (left-right for lateral moves, top to rotate brick, and to accelerate the descent). 
The goal is to establish complete lines as shown below : (1 lines = 10 points, 2 lines = 40 points, 3 lines = 80 points, 4 lines = 160 points) 
The future piece that will appear is shown in a frame in the upper right corner : 
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