?????????
       +----------
HVTNNX | LRWZPPXXR
        -PMVZWW
         ======
          JYXQRX
         -JGTPUL
          ======
           YLHXTX
          -NQZZXM
           ======
            JQVZUR
           -JGTPUL
            ======
            ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium