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"On this map, playing as Barbarians against a Castle is like banging your head against a wall."
I agree, but despite that, the map has become popular. The last three games in a row were played on it. :)
"This is the main thing you should stick to! Build the Grail, but only after opening all the obelisks."
I absolutely agree. It should only be done after opening ALL the obelisks. Otherwise, it's unfair, because the Grail can be found after visiting only 2-3 obelisks, and then it will be luck that determines who gets it based on which picture is revealed.