program. Even though 1UP.com noticed slight improvements in Brain Age 2, they found that it also introduced new issues. They considered it difficult for the game to understand their writing, and were also displeased with what they perceived as an arrogant tone with Dr. Kawashima, the game's avatar. Disappointed with the lack of new additions to Brain Age 2, GamePro asked readers "[not to] expect too much more content than new tests and more Sudoku grids". Nintendo World Report was also unhappy with the game, telling players who were "hoping for an overhaul [...] to wait for the inevitable Brain Age 3". The Toronto Star reminded its readers that although Brain Age 2 bills itself as a game that is able to make players smarter, it actually means that "the word smart has been temporarily re-defined to mean 'good at playing Brain Age 2.'" Brain Age 2 was the 13th best-selling game in its debut month of August 2007 in the United States, and climbed up to 9th place in September 2007, selling 141,000 copies. It was the 10th best-selling game for October 2007, selling 116,900 copies. The game reached 7th place in December 2007, then went down to 9th place in January 2008, and dropped further to 16th the following month. In August 2008, the game was the 13th best-selling game in the United States, and the 11th best-selling game in Canada. In Japan, the game was the best-selling game during its debut month of January 2005, selling 1,084,857 units. By March 2006, the game sold 1.7 million copies. For the week of May 15–21, 2006, the game was the 2nd best-selling game, with 62,000 units sold that week and 2,281,000 copies since its release. As of July 2006, Brain Age had sold 2,539,922 copies while Brain Age 2 had sold 2,752,211 copies in Japan, outselling its predecessor by more than 200,000 units. As of July 2007, 5.33 million copies of Brain Age 2 had been sold in Japan. The game received a "Diamond" sales award from the Entertainment and Leisure Software Publishers Association (ELSPA), indicating sales of at least 1 million copies in the United Kingdom. More than two-thirds of the people who purchased Brain Age 2 are over the age of 25. As of March 31, 2013, the game's worldwide sales have reached 14.88 million. Effectiveness A survey conducted by Alain Lieury, a professor of cognitive psychology