Professor Layton vs. Phoenix Wright: Ace Attorney is a visual novel adventure puzzle video game for the Nintendo 3DS, and was developed by both Capcom and Level-5, the latter publishing it in Japan while Nintendo published it worldwide. The game is a crossover between two game series from both developers, combining the puzzle and exploration elements of Level-5's Professor Layton series, and the general trial mechanics of Capcom's Ace Attorney adventure series, the latter enhanced by the addition of a few new elements, including multiple witnesses and jury trials, a concept continued with into the prequel series The Great Ace Attorney. Shu Takumi, the series director for the Ace Attorney series, assisted with the scenario designs for the game. The plot focuses on Professor Layton and Phoenix Wright, along with their respective assistants, working together to solve the mystery behind a young girl that they both encounter separately, and a strange world they are brought to through her, with Layton focused on solving puzzles and finding clues to solve the mystery, while Wright focuses on defending people who are put on trial for being "witches".

Professor Layton is a puzzle adventure video game series and transmedia franchise developed by Level-5. The property consists primarily of seven main video games, a mobile spin-off, an animated theatrical film, and an anime television series, while additionally incorporating an array of secondary titles and media, including a crossover game with Capcom's Ace Attorney series.