RNPJ
      +---------
RJUMJ | FPLUJUWU
       -PUFWU
        =====
        RRPYTU
       -RQTXHU
        ======
          GYRXW
         -LQULX
          =====
          QWLRWU
         -QWWUGT
          ======
            HLWN

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