Limbo is a puzzle-platform video game and the premiere title of independent Danish game developer Playdead Studios. The game was released in July 2010 on Xbox Live Arcade. Limbo is a 2D sidescroller, incorporating a physics system that governs environmental objects and the player character. The player guides an unnamed boy through dangerous environments and traps while searching for the boy's sister. The developer built the game's puzzles expecting the player to fail before finding the correct solution. Playdead called the style of play "trial and death", and used visually gruesome imagery for the boy's deaths to steer the player from unworkable solutions.