YYWP
      +---------
YJMXX | NQUPNYGJ
       -QGYVX
        =====
         NGXWY
        -QGYVX
         =====
         PHWTQG
        - JZTUH
         ======
           LHVGJ
          -YJMXX
           =====
           YPYML

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