Stacking

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 Live Arcade and PlayStation Network stores.

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.

The player controls the smallest doll, Charlie Blackmore, who is attempting to reunite his family that is being forced to work for an evil industrialist named The Baron.Charlie is able to jump inside dolls that are one size larger than him and control them, as long as the larger doll is facing away from him. If the player already controls a stack of dolls, that stack can jump into a one-size-larger doll as well. The player can also unstack the dolls at any time in order to enter dolls smaller than his current stack. Certain unique dolls, outside of Charlie, have their own special abilities—such as the ability to unlock doors, float to higher locations, or lure other dolls around, which can be used by the outermost doll. Thus, the player must stack and unstack the set of dolls possessed by Charlie to solve puzzles throughout the game. Later puzzles may require the use of multiple dolls to combine their skills.

The various challenges for each mission contain multiple solutions, with rewards offered for finding all of them. For example; in a challenge where the player must clear out a lounge of rich people, players can either sneak in a poorly dressed man into the party, or have another character flatulate into an air vent to clear everyone out. There are also rewards for completing side missions, discovering unique dolls, finding and stacking a matching set of dolls and performing "Hi-jinks" with certain dolls. Along with achievements and trophies, rewards can be viewed via dioramas constructed by Charlie's hobo friend, Levi.