JJZX
      +---------
LNXVG | TXQTJUVT
       -LNXVG
        =====
         PHXVU
        -LNXVG
         =====
         UGHHJV
        -UHUTMJ
         ======
          YZRLNT
         -YQVXGL
          ======
           YPVPJ

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
missing: W