Nintendo DS Big Brain Academy

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From Wikipedia: 

Big Brain Academy is a series of puzzle video games developed and published by Nintendo. Similar to the Brain Age series, each game features a number of activities designed to test, measure, and improve the player's mental skills.[1] The first two games were released under the Touch! Generations brand, which has since been discontinued.

Each game features a character named Dr. Lobe, the headmaster of Big Brain Academy who acts as a guide for players.