First of all, use it to participate in the Time Machine contest. You can participate only once daily so that's already 30 TCredits. If you win, you get much more than 30 back (I mean look at the previous winners announcements)
Second, participate in Pick The Price. I usually decide how many I want to participate daily. It is usually around 5 daily. That's actually about 150 TCredits already, but I once won more than 100 TCredit in Pick The Price, so I think you get it back.
Thirdly, participate in Pricebenders. Choose the First win Auction coz the heavy hitters won't be there. Choose the Double MRP auctions coz if you don't win, at least you get 10 MRP each bid and those MRPs can be used to buy items from TripleClicks.
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First of all, use it to participate in the Time Machine contest. You can participate only once daily so that's already 30 TCredits. If you win, you get much more than 30 back (I mean look at the previous winners announcements)
Second, participate in Pick The Price. I usually decide how many I want to participate daily. It is usually around 5 daily. That's actually about 150 TCredits already, but I once won more than 100 TCredit in Pick The Price, so I think you get it back.