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I'm on my smartphone after reformatting it and check my purchase history, I'm not able to re-download any THQ games I bought, the money has gone to waste.
Further to this point; 3DS downloads don't have an account system, and even if they did; games you may need to re-download are at the mercy of the publisher. I buy all games physically when I am able and so should you if the option is there.
What's your excuse? Convenience or a high break in rate in your area?