I can't buy Halo 3 on my xbox one

The Xbox One/website have never been updated to work with your Microsoft account balance to purchase 360 content. The only way to use your balance would be to make the purchase from a 360 console.

Oh thanks for the reply Smwutches, you are my Hero. Only one question: Then I bought Halo 3 on a 360 xbox, can I play Halo 3 on my Xbox one?

Yes. Since it's backwards compatible it would work on the One.

The Xbox One/website have never been updated to work with your Microsoft account balance to purchase 360 content. The only way to use your balance would be to make the purchase from a 360 console.

I buy my xbox 360 only for Halo. So, naturally, the first game I play in it was Halo 3. Also, I buy my One just for Halo 5. But it took almost a week to be downloaded (almost 100Gb).

"Have played Halo 3 for about 30 minutes, It's just another Halo. Also I must be an idiot because I bought Fable 3. You can't compare a Halo game to demon or dark souls, completely different genre".

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It's one of the best Halo games, and my personal favourite. You are an idiot for buying Fable III, and you can compare Halo to Dark Souls.