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I really liked Nostra; I think it's the most challenging of all the maps I've played before. To put it in Alfein's terms, I can confidently say that the "boomerang" is more addictive than "Diamond." The treasures are shared, and they contain relics. Whoever gets a head start and acquires more resources will reach the treasures sooner and claim them faster. In Diamond, the treasures are not shared, and there's some time buffer.