User blog comment:Shadowunleashed13/Webber explains Lost World's 25-life DLC/@comment-4018912-20131004034958/@comment-5215338-20131004150240

Webber did specify that the difficulty was, in a sense, customizable because of the many different paths with different levels of difficulty. Each path is completely separate, unlike in Generations, so you can start with the easy routes and work your way up to the harder routes.