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212c208 Dec 11, 2015
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This entry implements the "shell game", also known as "follow the ball in the cup". To play:

  1. Run program once to shuffle, piping output to another file:

    ruby entry.rb | tee result.rb

  2. Guess where the ball is, and run output to reveal result:

    ruby result.rb | tee entry.rb

  3. Go back to 1 to play again.

If this game is too hard: try easy.rb, which will run the same game at slower speed.

Requires zlib. Verified to work on:

  • ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]
  • ruby 2.1.5p273 (2014-11-13) [x86_64-linux-gnu]
  • ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-cygwin]