NWPJ
      +---------
VHNLX | PVTLRYRW
       -NQGZN
        =====
        VGMNGY
       -VPQJZR
        ======
          HRJRR
         -GTZHP
          =====
           YWVMW
          -LLQRJ
           =====
           VVPQG

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium
missing: U