The new Anniversary Sonic game the Sonic Boom: Fire & Ice (which is called in Japan Sonic TOON Fire & Ice) already available in North America and Europe on Nintendo 3DS but in Japan the game release only on October 27, 2016.
But from the Japan Nintendo eShop you can buy today three, special, 25th Anniversary Nintendo 3DS themes based on Sonic and the latest Sonic Boom (TOON) game.
You can buy them one by one for 200 Yen (with tax) but if you buy all the three together in one package you can grab them for 500 Yen (with tax).
Each theme compatible with the Nintendo 3DS and the New Nintendo 3DS series and comes with different designs and BGMs. For the Sonic fans they are must have ones!