WNL
      +--------
GGFNN | MYGQMXG
       -JYRJT
        =====
         FYRQX
        -RQRTW
         =====
          WPUNG
         -LRRFW
          =====
          GGHNL

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