After starting the game, slow down the speed to the lowest settings then click Game Menu. A list of options will appear. Click Enter Code and type one of the following codes. Then do what you want and speed up the simulator as you want.
Once you've started the game, be sure to lower the game speed to the lowest setting. Then click Game Menu, Your see a list of options. Click on "Enter Code" then type in the code of your choosing. Then start building and speed up the simulation as wanted.