You need buy addon - RainBow Cube:
http://www.hknowstore.com/item.aspx?corpname=nowstore&itemid=77942bb6-7a7d-4f8b-a909-75a6ebf4758f
http://www.lightake.com/detail.do/sku.14_Side_XM_Rainbow_Magic_Cube_White-33869

and glue this tile set

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1. You purchase DIY Kit (do-it-yourself kit). It’s not an assembled puzzle, but separate details.
2. You also have to buy a set of stickers or cut them by yourself.
http://speedcubing.hu/webshop/index.php?main_page=index& cPath=6_32&zenid=22a47ccc650ae4b483421bf75ef75758
sticker seller: Olivér Nagy - rubikkocka@gmail.com