The computer games are based on the Swedish children's book series of the same name, by George Johansson and Jens Ahlbom.
All five parts are available for Windows, four of them also for Apple Mac, except for the computer game Bygg flygplan med Mulle Meck.
In the first video game, Bygg bilar med Mulle Meck, published in 1997, Gary builds cars from various parts and junk that he finds and drives through the town.
In the second game Bygg båtar med Mulle Meck, published in 1998, Gary builds ships.
In the third game Bygg flygplan med Mulle Meck, published in 2000, the player gets to know that Gary has found the abandoned hangar of two airplanes constructors and wants to try that trade.
In the fourth part Bygg hus med Mulle Meck, published in 2002, Gary Gadget finds his house in debris after a storm caused a tree to fall on it.
The German c’t magazine rated the game Bygg bilar med Mulle Meck thus: "Autos bauen mit Willi Werkel ist nett gemacht, kann aber eigene Bastelerfahrungen nicht ersetzen.
[Bygg bilar med Mulle Meck is made nicely but cannot make up for one's own construction experience.
]"[1] Netzwelt.de tested Bygg flygplan med Mulle Meck on 7 February 2010, concluding that it was well suitable for children at primary school age.