![]() In this way, tetrominos can make it more difficult to complete underlying lines. In many versions, the moving rows do not fill any gaps that existed before. The tetrominos remain in the position in which they land instead of tilting according to gravity. ![]() In the original form of the game the pieces do not behave physically correctly. Thus the simultaneous erasure of four rows is also colloquially referred to as Tetris. The name of the game comes from the ancient Greek word tetra and refers to the number of squares per tetromino. ![]() For the simultaneous deletion of several rows, the player receives a higher number of points per row than for a single row. All the rows above it move downwards, thus releasing part of the playing field. The player has to rotate and move the tetrominos, which fall down individually from the upper edge of the rectangular playing field, in steps of 90 degrees, so that they form horizontal rows at the lower edge which are as gapless as possible. Today, Tetris is considered a computer game classic, has sold over 100 million copies in the meantime, has won many awards and has appeared on more than 65 computer platforms. ![]() Tetris is a puzzle-like computer game by Russian programmer Alexei Paschitnow, who completed the first playable version on Jon an Electronica 60 computer.
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