VGTH
      +---------
PGGNJ | VYHTNHWV
       -VLTZM
        =====
         WJVPH
        -WPVQG
         =====
          NQVVW
         -NHMMW
          =====
           LZLXV
          -ZTUHY
           =====
            JNTG

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