Not sure how easy or hard this will be, but... Welcome to the tenth codegolf challenge! In this challenge, run a setwise XOR through two lists, and output the results in an output list. A setwise XOR means that you will only include items that are in exactly ONE list, but NOT both lists. So [1, 4, 5, 6] and [5, 2, 1] as input1 and input2, respectively, would result in an output of [4, 2, 6] or any of its permutations. String support is not needed, and do anything you like for duplicate elements.
Entries: @AmazingMech2418, 12 blocks, nonterminating: https://scratch.mit.edu/projects/409939825/ @Geotale, 10 blocks: https://scratch.mit.edu/projects/409945397/ @scratchboybob, 20 blocks, supports strings: https://scratch.mit.edu/projects/409938331/ @_-PJN-_, 10 blocks, nonterminating: https://scratch.mit.edu/projects/409940652/ @ethmah01, 10 blocks: https://scratch.mit.edu/projects/410016540/ @I8D, 10 blocks, nonterminating: https://scratch.mit.edu/projects/410186811/ @K-NN, 10 blocks, nonterminating: https://scratch.mit.edu/projects/416896305/