Samurai Persistence

Sorry for the off-topic and for not sticking to the subject. But can anyone tell me why the "Invasion" thread by Master is closed? I wanted to write a couple of words there, but it's locked. :( There's not much to write there anyway – his map is simply impossible to beat on Hero difficulty! I'd like to know who managed to complete it on Hero difficulty; I'd shake his hand, but it seems the author made it excessively difficult.