I have noticed a big difference between high stakes NL ring and low stakes NL ring. The play at low stakes NL varies greatly from the chess match of a high stakes NL ring game. I have played thousands of hands at different levels of NL ring and have learned to adjust my game to my opponents. At the low stakes NL games I tended to do a lot more hardcore multi tabling where I basically just camped and let the fish make all the mistakes. At the high stakes I would usually only play 2-3 tables becuase of the fact that you cant just sit back and let them make the mistakes, you have to force them into making the mistakes you want them to. You have to use their own reads and intuition against them to lead them to believe you have the opposite of what you really have. I think a lot of players can beat low stakes NL ring by just having a 15% VPIP and just grinding away. At the higher stakes you have to be willing to trust your reads and be able to act on them with hundreds or even thousands of dollars at stake. The "bluff" is important at higher stakes. As you move up the ladder I would say you need to do lmore and more bluffing to win. You need to learn to represent a hand you dont have if you want to win at high stakes holdem.