PPTW
      +---------
RGJVT | JMTXXUYV
       -JUNGQ
        =====
         URPZU
        -JUNGQ
         =====
          WWUNY
         -YTTNR
          =====
          RUXHGV
         -RJGMRU
          ======
           RPMLR

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