#2 Professor Layton Series
Professor Layton is a series of puzzle games for the DS and 3DS developed by Japanese studio Level-5. Each of the games are based in a series of puzzles and mysteries provided to the two protagonists—Professor Layton and his assistant Luke—by townspeople.
The puzzles range everywhere from arithmetic questions to logic puzzles, some of which are mandatory for the player to progress through the story while others are completely optional.
The series has become one of the most popular puzzle games on Nintendo's handheld consoles and is expected to see a crossover with another popular series of games—Ace Attorney.