Puzzles and tiers

so I see that there are 8 tiers (wood to Legend), with 20 rounds each tier. After you finish the Legend Tier, you go back to the Wood tier and get Prestige2, do the 8 tiers again and you get Prestige3, and so on. Does this just keep going or does it ever end? Also, nowhere on the web site do I see my pawn changing.