????????
      +---------
NWPWR | MLTTHGFT
       -QWXWF
        =====
         GMTGG
        -LULWT
         =====
          HGFTF
         -TRJWL
          =====
           UYHYT
          -FUYWQ
           =====
           ?????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: intermediate