From Wikipedia: Best of Tests DS is an educational video game released for Nintendo DS in North America on March 4, 2008. The game intends to present tests and puzzles that will help stimulate one's Intelligent Quotient or "IQ" through five categories: logic, observation, memory, speed of perception and analysis. The game contains three gaming modes: Training, Memory and Tests. Best of Tests DS calculates the player's IQ and adapts the difficulty level in order to provide a personalized challenge that is always renewed and updated.