Tetris (Electronika 60)

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Original Tetris.png
Developer(s) Alexey Pajitnov
Release date(s) 1985, USSR
Platform(s) Electronika 60
Gameplay Info
Next pieces 1
Playfield dimensions 10 × 20
Hold piece No
Hard drop Yes
Rotation system Original Rotation System
Original Tetris Title.png Original Tetris Gameplay.png

The original Tetris was programmed by Alexey Pajitnov using the programming language Pascal on an Electronika 60 (Russian: Электроника 60) - an unauthorized Soviet clone of a Digital Equipment Corp. PDP-11 computer. The game has monochrome graphics, and in the first revision of the game, the blocks in the tetrominos are represented by a pair of delete/rubout characters (character code 177); however, the rendering of this character code as a rectangle was a feature specific to the Soviet clone machines, an actual PDP-11 would instead display nothing. A later revision was made where the blocks are represented by a pair of square brackets instead.


  • Points are awarded for each tetromino successfully dropped into place.
    • At level 0, the potential point score for each tetromino starts at 19, and decreases by 1 every time the tetromino descends a row due to gravity. As can be seen, an I tetromino falling freely from the top of the playfield to the bottom will descend 19 rows and score 0; it is never possible to score less than 0.
    • Playing at higher levels awards an additional 3 x (Level + 1) points per tetromino.
    • Playing with the preview disabled awards an additional 5 points per tetromino.
  • 3 digits are provided for score display; when 999 is exceeded, the counter rolls back to 0 and a tally of symbols appear in order to keep track of thousands.


It is sometimes possible to manipulate a tetromino after performing a hard drop, even though it is supposed to be locking. Doing so will leave a trail of blocks behind, which, although visible to the player, are not recognized by the game as actually being there. This can lead to a variety of unusual scenarios, for example, visibly complete rows will not clear, and tetrominos can be dropped through the stack.

See also

External links