Stacking is an adventure puzzle video game developed by Double Fine Productions and published by THQ; like Double Fine's previous Costume Quest, it is a smaller title created during the development period of Brütal Legend, and was released in February 2011 for the Xbox 360 and PlayStation 3 video game consoles. A Windows version was released on March 6, 2012. A Linux version was released in May 2013. The game is based on the Russian stacking matryoshka dolls, an idea coined by Double Fine's art director, Lee Petty, who saw the dolls as a means to replace the standard player interface used in graphical adventure games. The player controls the smallest doll, Charlie Blackmore, who has the ability to stack and unstack into larger dolls and use their abilities to solve puzzles to allow Charlie to free his older siblings and put an end to child labor enforced by the antagonist, the Baron. Puzzles within the game have multiple solutions, and include additional puzzles and challenges that allow the player to explore the game's world outside of the main story. Stacking was well received by critics and praised for its alluring appearance, humorous story, and accessible gameplay for casual players. Plot Set in a fictional version of the industrial age, the story begins with William Blackmore, a professional chimney sweep, leaving his family to take a job under a powerful industrialist, the Baron. A few months later, with William having failed to return and the family deep in debt, the four Blackmore children (Albert, Agatha, Abigail, and Archibald) are forced into apprenticeships by the Baron's agents, leaving the youngest, Charlie, alone with his mother Agnes. A few weeks later, a pigeon arrives with a letter from Albert, who reveals that the Baron has split up him and his siblings, forcing them to work as slaves. Charlie subsequently sets out to rescue them, recruiting a friendly hobo named Levi to help him set up a hideout in an abandoned section of the Royal Train Station, where a strike has forced the station's management to use Albert and other children as coal shovelers. Charlie sets up a meeting between the strike leader and representatives from the Train Guild, breaking the strike and freeing Albert. Another letter, this time from Agatha, then leads him to the Baron's private cruise ship, the Commodore Perry, which is currently embarked on a never-ending voyage. By turning