Tetris

Tetris is a single-player puzzle game created for IBM PC-compatible computers by Alexey Pajitnov and Vadim Gerasimov and distributed under the AcademySoft name in 1986. It was based on Pajitnov’s original version for the Soviet Electronika 60 computer, but was substantially rewritten for MS-DOS. Gerasimov, then a sixteen-year-old student, produced the PC conversion in cooperation with Pajitnov, while Dmitry Pavlovsky contributed to the development of the early game and its scoring system. Unlike the later commercial editions published by Mirrorsoft and Spectrum HoloByte, the AcademySoft version circulated freely among computer users.

The player guides seven differently shaped tetrominoes as they descend into a rectangular well. Pieces can be moved sideways, rotated counter-clockwise or dropped immediately, and complete horizontal rows disappear from the playfield. The objective is to prevent the accumulating blocks from reaching the top for as long as possible. A window displays the next tetromino, although this preview can be disabled in exchange for additional points, adding a simple element of risk and reward.

Several features distinguish this early edition from later interpretations of Tetris. Players can choose a starting level, accelerate the falling pieces and use an immediate firm drop. Its scoring system primarily rewards the placement of individual pieces, the selected difficulty and playing without the next-piece preview; clearing multiple lines does not provide the increasingly large bonuses familiar from subsequent versions. The controls use number keys inherited from the numeric keypad, although the space bar can also be used to drop a piece.

The game operates in a coloured text mode rather than using conventional bitmap graphics. Tetrominoes are represented by coloured character cells, producing a clear and functional display that could also adapt automatically to IBM monochrome graphics hardware. Gerasimov implemented timer-based delays so that the game maintained approximately the same speed on different PC models, avoiding the common problem of early DOS games running too quickly on newer computers. The presentation is otherwise extremely austere, with no decorative backgrounds or elaborate audiovisual effects.

Although primitive beside the commercial versions that followed, AcademySoft Tetris contains almost everything required for the game’s enduring appeal: simple rules, immediate feedback and steadily increasing pressure. More importantly, the IBM PC conversion allowed Tetris to spread rapidly beyond the Moscow computing centre where it originated. Copies reached other parts of the Soviet Union and Eastern Europe, eventually attracting the attention of Western software distributors. It therefore represents not merely an early DOS puzzle game, but the version that helped transform Pajitnov’s experiment into an international phenomenon.