????????
      +---------
YQPRQ | RCTRGLQC
       -CRPCN
        =====
        ENCEPL
       -ECNUJJ
        ======
         LRQPLQ
        -LNTUNJ
         ======
           PJTQC
          -UEPQJ
           =====
           ?????

base: 12
letters: CEGJLNPQRTUY
difficulty: challenging