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  A Mini Retro Puzzle for DOS PCs                          r44 -- 2018-09-05
  (286+, VGA, PC-Speaker / OPL-2 / MIDI / CD-Audio)

  A simple puzzle game. Initially it fit into just 8 KiB, then grew to 16 KiB
  and now is a 21 KiB monster executable  (it will still fit nicely into your
  available RAM, I'm sure).   This release adds 2 new methods of playing back
  sound: PC-Speaker (super lo-fi) and CD-Audio (very hi-fi).

  How to play: There are 2x2-blocks falling down the top, with two different
  colors. Use LEFT/RIGHT/DOWN to move the block and use UP to rotate it. Use
  SPACE to drop the block (it will fall fast until it lands).

  Create 2x2 blocks of the same color. These will be marked by the sweeper
  (the line moves left-to-right) when it passes the blocks. When it restarts,
  all marked blocks will be removed and you earn points. The HJKL keys can
  also be used to move. "S" switches the soundtrack (the default is "Descent"
  by Tim Samoff <samoff.com>, the other is "Clickedy" by me ;). "P" toggles
  pause mode, "Q" quits the game.            -- thp <thp.io>, September 2018
