Just a thought. Maybe you could extra stars or some other perk for beating the levels on the harder difficulties. Right now there is not much incentive to do so.
@ theGameMaster123, You do know that the President of the United States does have time off right? If he had time to show up on Mythbusters and the NCAA half time show, then I am pretty sure that he has time to play games. That being said, I do agree that he didn't really say it.
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It's planned for a sequel. In RW1 it's almost impossible to add it.