Is this game original? I bought it at Hong Kong.
I once try at my NDS, it works but cant load in NDSi.

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NDSi is a region based platform, so it depends on which region your NDSi is..
NDS phat till NDSlite is a free region tho.. that's why you can play it on your NDS instead of your NDSi.
Note that NDSXXL is a region based platform and so does the upcoming N3DS..
so consider that before you go buy it when it comes out here.