I did not see a mention about how you can break the first half of game by simply freezing the clock by yourself and purely completing challenges. Sure at some point you have to let a day or two go to get the end of day profit challenge. Also it's mostly a waste of time to hire 200 people for the challenge when you can still win by upgrading already existing workers and researchers.
 "Idle Empire 3"){kind=icon}
 "Corporation Inc."){kind=icon}
 "Millionaire To Billionaire"){kind=icon}
 "NYC Mafiosi"){kind=icon}
 "Mad CEO"){kind=icon}