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  | UnkaTris, tetris clone for the unexpanded 1K ZX81 |
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  Keys:     1 (left), 2 (right), 3 (down), 4 (rotate)
            Same combination in every row, ie QWER, ASDF...
  Levels:   27 different levels
  Features: Basic 10x20 grid, next piece, score, random freeze
  Skills:   1 very hard, 2 hard, 3 medium, 4 easy, 5 very easy
  Points:   10 for single line, 30 for double, 70 triple and 150 tetris
  License:  GPL, except UnkatrisCompress.c that has its own
  Author:   Antonio Villena
  Credits:  hikoki. Betatester and design some levels
            Einar Saukas. I use his fantastic compressor source code
            Cthonian Godkiller. Contribute with the name, UnkaTris