User blog comment:PeppermintSoda/And yet the game goes on! Cookie Run updates to a seventh season!/@comment-26044650-20150821201500/@comment-33658145-20150926084906

I haven't paid attention to the difficulty of the levels, but what I can guess is that the challenges increase by difficulty, and the levels gradually get harder slightly. The first challenge would always by easy enough for new players to advance to the next floor, if they have the right treasures.

Also, some levels can not be completed if players don't have the right cookie and/or pet for the levels that allow cookie's and pet's abilities. There are "boss" levels on the 30th, 50th, 60th, and 70th floor, with a boss similar to the one in the last stage of Episode 4.