Each level has got its own challanges. It is easy to manage between same level people. Inspiring each others will be much more easy. Checking achievements , making comments,because not everybody at the same level achieves the same results. It is easy to share tips while being at the same level. Cuz, new level means new challanges and past challanges and tips will be forgetten for helping newcomers to exactly that level that they were before.
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