Nice!

Some comments ...

• I get errors like

  Tk::Error: bad screen distance "" at /pro/lib/perl5/site_perl/5.24.1/x
  +86_64-linux-thread-multi-ld/Tk.pm line 251.
   Tk callback for .canvas
   <Button-1>
   (command bound to event)
  [download]

• Clicking on one end of a block should move it in that direction
• There should be a button Next game after "Victory"

You might enjoy Nintendo DS Braintrainer and Mastermind I once wrote

update:	I notice that mastermind is currently broken. Need to check why
update2:	Found fixed and uploaded again < is less colors, > is more colors, [ is less squares, ] is more squares

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