HQX
      +--------
WNGXH | TXHRRQL
       -UHPFT
        =====
        WNFHMQ
       -WFUYMY
        ======
         WUTJWL
        -WHFMHF
         ======
           XRYQ

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard