???????
     +--------
XPPX | RFPXXWU
      -XPPX
       ====
       EFPPX
      -EEPEE
       =====
        QWWFW
       -QGPQG
        =====
         EWQEU
        -ERPER
         =====
         ?????

base: 9
letters: EFGPQRUWX
difficulty: medium