XTLG
      +---------
NGMHZ | LNQZPVXW
       -NGMHZ
        =====
         RHNQV
        -YMVUY
         =====
         XJQPPX
        -XLRYGP
         ======
          XYRNGW
         -XHLUXH
          ======
           TWNNZ

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