The purpose of the game is to complete as many lines as possible. You can move, rotate (clockwise or anticlockwise) and force-drop the piece that comes from the top of the screen until it touches any other piece or the bottom of the board. You can also hold the piece replacing it with the next piece (if not piece was held previously) or with the piece previously held. More points are awarded when force droping a piece from higher. You complete a level when you complete 20 lines. Each level makes the pieces fall faster but also gives more points for each line completion.
The game is over when a newly created piece does not have enough space to move.
Tetrada is a greek word that means “four of a kind” or “group of four”.
Tetrominoes are the four element special case of polyominoes. Polyominoes have been
used in popular puzzles since at least 1907, and the name is given by the mathematician Solomon W. Golomb in 1953. However, even the enumeration of pentominoes is dated to antiquity.
The gameplay is similar to a well known tetrominoes game, Tetris (TM).