Let me help you a bit. There is not such a thing like a "Nintendo 3DSi". You must be refering to the Nintendo DSi. If thats the case, you can't play it on it. This game is only for the Nintendo 3DS System, because it is the new generation of Nintendo handhelds. All the new Nintendo games like Mario Kart 7, Super Mario 3D land, Animal crossing, Luigi's Mansion and all the future Pokemon Games are for Nintendo 3DS System.