?????????
      +----------
XTTQJ | JZVMZNQPT
       -XTTQJ
        =====
         ZURUN
        -MTLRP
         =====
         QUUGGQ
        -QRTVXV
         ======
          YUPZNP
         -YQTNZX
          ======
           XHWTRT
          -XPTXYH
           ======
           ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
attributes: excellent