1. Issues

1.1 How to storage the block ?

Using 16 bit to indicate which block is.

1.2 When to stop the game ?

New block hit the old area out of the game area.

1.3 How to transform block ?

Just move to right of same type block. The same block has four shape. Wo totally have 35 shapes.

1.4 How to remove line ?

How to solve problem when romve line, there're new completely line. This problem will not happened. Tetris game is not same as happy and happy. Grids just fall down to the original remove line.