310
      +--------
AFDED | 68BC32E
       -E825A
        =====
        B74AF2
       -B807E4
        ======
         3A2AEE
        -331D51
         ======
          BFD15

base: 16
letters: 0123456789ABCDEF
difficulty: challenging
attributes: long, meticulous
missing: 9