The fifth Bonus Round, Sudoku Nebula, begins in 33 minutes. Here is a quick link to the Submission page: https://logicmastersindia.com/live/?contest=WSPC2021_B05 The specific IB has been shared in this thread and on the landing page. The puzzle booklet is available for download on the submission page. The password will be available when you start the contest, as usual.
Question for Sudoku Nebula--does each region obey exactly one rule? So, for instance, a Clone shaded area can not contain only Evens or only Odds?
There is no restriction on a region taking up more than 1 rule. For example, the "Odd"-assigned region may end up having cells add up to 21.
But in the end, all the rules must be accounted for, in the exact number that was given in the IB, (Eg. 3 of Extra Regions, 2 of Clones ... and so on.)