This cheat can do two different things. Firstly, it can unlock all game stages (levels -unlock), allowing you to start a game from any stage (either cell, creature, tribal, civilization, or space). Secondly, it can unlock all Maxis adventures (levels -unlockAdventures).
The syntax for the levels command is as follows:
levels [-unlock / -unlockadventures] Joker Badge
This command has the following arguments:
|-unlock / -unlockAdventures||Specify '-unlock' (without quotes, whilst in the main menu) here to unlock all stages, allowing you to start a game from any stage. Specify '-unlockAdventures' (without quotes) to unlock all Maxis adventures.|
Find below working examples of the levels command.
The above command will unlock all game stages - allowing you to select any game stage from the main menu.
This command will unlock all Maxis adventures.