This is one of the great success stories so far this year (maybe in the entire generation). There were more doubts about Splatoon's commercial potential success with valid reasons such as being a new Nintendo IP, recent history (Codename STEAM, The Wonderful 101, etc.), and the low install base. Fortunately, Splatoon proved even the most adamant supporters wrong selling at a rate close to Mario Kart 8 and it is boosting Wii U sales, even if it is a little bit. People got invested in the game due to intuitive gameplay that slowly, but surely, grew as we continued to get free updates and as the players, themselves, started getting better.