????????
      +---------
NHQLJ | LXHRUNHU
       -LTFYH
        =====
         YTWGN
        -WGXML
         =====
          QQYPH
         -HPNYJ
          =====
           JWFJU
          -XYXXH
           =====
           ?????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard