????????
      +---------
WLJMQ | HRNJHGWM
       -RGQTG
        =====
        WXUYJG
       -WXGYHR
        ======
          LTNTW
         -YFPGN
          =====
          WJWPHM
         -WWNRLL
          ======
          ??????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard