Stacking is a puzzle game where characters are Russian stacking matryoshka dolls. Controlling the smallest doll in the game, Charlie Blackmore, you go on an adventure. Your main ability is that you can stack and unstack into larger dolls and gain their abilities to solve puzzles.

It's a novel idea made all the better because each puzzle has a number of ways it can be solved. Find a particularly elegant solution and you find additional puzzles and challenges that flesh out the wider world of the game.

The game is set in a fictional industrial age and tracks with events of the time featuring chimney sweeps, powerful industrialists and child apprenticeships. As Charlie, you are tasked with rescuing your siblings from the workhouse as coal shovelers.