With the recent success of New Super Mario Bros Wii (in a red box) outselling Super Mario Galaxy in just a few sort months, Nintendo decided to follow the same marketing strategy and change their box colors on unfavorable Teen + (compared to E 10+) games to attract more hardcore gamers. Nintendo is testing this marketing strategy first in Japan on the soon to be released title Zangeki no Reginleiv, the first CERO D (17+) rated wii game in Japan. Nintendo has also stated that the black boxes are also meant to warn parents of mature content.