????????
      +---------
LXVVP | XZUJWXGX
       -NPYPQ
        =====
         PJXUX
        -YRHJJ
         =====
          XXPJG
         -NPYPQ
          =====
           QHMXX
          -WQHLL
           =====
           ?????

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