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Going back to previous levels isn't counted as cheating @klebsonaviz in fact it is even hinted at in the T&Cs of the competition.
5.2. Points: Participants will be tasked with collecting special All Stars candies in any given Stage in the Tournament. Participants will receive additional All Stars candies on for successfully completing new/uncompleted levels during the Tournament.
The fact that the T&Cs state that players will receive extra All Stars candy for playing new levels alludes to the fact that people that don't play new levels will not get the X30 bonus