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".

Ace Attorney is a visual novel adventure video games franchise developed by Capcom. With storytelling fashioned after legal dramas, the first entry in the series, Phoenix Wright: Ace Attorney, was released in 2001; since then, five further main series games, as well as various spin-offs, prequels and high-definition remasters for newer game consoles, have been released. Additionally, the series has seen adaptations in the form of a live-action film and an anime, and has been the base for manga series, drama CDs, musicals and stage plays.