QGW
     +-------
QXQX | LMUNFL
      -JQJQ
       ====
       XNGHF
      -XENEG
       =====
        XMFGL
       -XMJMW
        =====
          UWU

base: 13
letters: EFGHJLMNPQUWX
difficulty: challenging
hints: W << M
missing: P