tetris-60

`tetris-60' is a tribute to the original 1984 Tetris created by Alexey
Pajitnov on the Soviet Electronika 60 computer.  It aims to capture
the authentic ASCII aesthetic of the early computing era—monochrome
screens, dotted playfields, and iconic `[ ]' blocks—as celebrated in
the *Tetris* (2023) movie.

The name reflects two historical origins:
- "Tetris" is a portmanteau of "Tetra" (the Greek prefix for four) and
  "Tennis" (Pajitnov's favorite sport).
- "60" refers to the Electronika 60 (Электроника 60), the rack-mounted
  terminal computer that hosted the first version of the game.  As it
  lacked graphics hardware, the original game was rendered entirely
  with text characters.