PJYP
      +---------
MHRUG | WLGYWWUL
       -LMRQY
        =====
        PPXMHW
       -PHQGYT
        ======
         HYLUMU
        -HLFXWP
         ======
           YGJYL
          -LMRQY
           =====
           HYGPR

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
missing: N