HYT
      +--------
HPHLT | GEPTNTQ
       -LQEQF
        =====
        UYGNGT
       -UETUGJ
        ======
         UPTPPQ
        -UNYYLP
         ======
          HHYYP

base: 13
letters: EFGHJLNPQTUWY
difficulty: hard
missing: W