I'm at the same stage, presumably looking for a name. The 5 letters of the third title elude me as well. Since everything else is beautifully symmetrical I'm guessing that these 5 letters are as well ... ?
Stuck on finding the third (presumably 5 cell) title. I'm sure it's by the youngest of the three which narrows it down to two candidates but i can't see either, whether the numbered squares are replaced or not. Please help me finish this!?