Big Mac the Mad Maintenance Man is a computer game published in 1985 by Mastertronic for the Commodore 64. It is a platform game in the style of Manic Miner. The game's full title according to the cover is More Adventures of Big Mac the Mad Maintenance Man although the game's opening screen uses the shorter title. Most fans, however, simply remember the game as 'Big Mac'.
The player takes on the role of the title character who must negotiate a power station consisting of 18 separate levels (vaults). On each level the aim is to avoid a range of defences and press switches to shut down the vault.