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In most cases, it all depends on the random generation rather than the map itself.
I've played Spider countless times, and it has a significant imbalance in terms of treasure placement – in one area, treasures cover half the map, while in another, they are scarce.
And regarding encounters, it's similar to 8mm6a; you can quickly encounter enemies. I remember our last quick match with Maretti on this map in the Champions League final – it was round 116, I think.