The most classical Russian Block.
There is no meaningless pretense.
Only 10M.
"It was originally designed and programmed by Russian game designer Alexey Pajitnov on June 6, 1984 while he was working for the Dorodnicyn Computing Centre of the Academy of Science of the USSR in Moscow. He derived its name from the Greek numerical prefix tetra- (all of the games pieces contain four segments) and tennis, Pajitnovs favorite sport."
"It was the first entertainment software to be exported from the USSR to the US, where it was published by Spectrum HoloByte for Commodore 64 and IBM PC. The Tetris game is a popular use of tetrominoes, the four-element special case of polyominoes. Polyominoes have been used in popular puzzles since at least 1907, and the name was given by the mathematician Solomon W. Golomb in 1953. However, even the enumeration of pentominoes is dated to antiquity."