NWMF
    +-------
XQW | QJJYYN
     -NMJ
      ===
       TGY
      -UPW
       ===
        HXY
       -LWW
        ===
         PXN
        -FRW
         ===
         XXM

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard