????????
      +---------
HHLRH | FJXLFUHG
       -HHLRH
        =====
        QEHUJU
       -QGUEXU
        ======
          FUCTH
         -HHLRH
          =====
          JHFFTG
         -JJLLTT
          ======
          ??????

base: 12
letters: CEFGHJLQRTUX
difficulty: hard