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Extreem II is absurd; the guards in the adjacent treasure room are 135, while in comparison, the guards in the GO map are 40. This will definitely result in a long game, lasting more than 2 months.
Clash of Dragons is quite interesting, but it's also not a fast map: there's a lot of snow and powerful guards protecting the passages between zones.
I agree with replacing Spider with Blockbuster; it's a good template, playable, and well-tested in the Polish league.