Classic PC`s game – old good tetris!

The object of the game is to manipulate blocks, by moving each one sideways (by Left and Right arrows) rotating (by Up arrow) and moving down (by Down arrow), with the aim of creating a horizontal lines of blocks without gaps. When such a line is created, it disappears, and any block above the deleted line will fall. As the game progresses, each created line causes the blocks fall faster, and the game ends when the stack of blocks reaches the top of the playing field and no new blocks are able to enter.