HNMX
      +---------
XNRHM | XXQTQMGG
       -XNRHM
        =====
         QWUGMG
        -QXPPXM
         ======
           RRGTG
          -MQUGX
           =====
           HPEXQ

base: 12
letters: EGHMNPQRTUWX
difficulty: medium