I don't really pay attention to rewards balances. I play just enough to earn discounted rooms, but not much else. Today I was updating my reservation for March and had a pretty simple question? What's the difference between Total Rewards credits and Tier credits? I have about 25,000 total rewards credits, but my tier credit score is zero. I read the explanation of the program and they sounded about the same. Is one of them a lifetime balance, while the other is over a period of time? I haven't been to a Harrah's property since August, but have a TR Visa that sees monthly action. It looks like I can convert the total rewards credits into free play. Am I reading that correctly? I'm sure this is CET TR 101, I've just never really attempted to understand these programs.