Franchise: Professor Layton
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The DS Start menu icons for the first four games in the series feature Layton gradually smiling more with each game before ending by pointing at something.
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The character Phoenix Wright (from the Ace Attorney series) influenced the creation of Professor Layton's protagonist and namesake. Level-5, the developer of the Professor Layton series, "researched the good and bad points of Phoenix Wright [and] developed the good points".