Selectivity can cause weaknesses.
To give you a better chance of solving this puzzle, we suggest that you look through some relevant background materials. For this puzzle we recommend that you look into the Fiat-Shamir Heuristic and the Arkworks material.
Consider whether the interactive protocol is secure. Was the leap from interactive to non interactive done correctly? Have a look at the paper linked here. It may point you in the right direction.
You can view all of the scores for this puzzle in the spreadsheet here
The winner of the puzzle write up was submitted by grjte,
which you can view
There were many excellent puzzle write ups submitted, you can view them
* Solution by TrapdoorTech
* Solution by Divide-by-0
* Solution by negativeknowledge
* Solution by Michael-Qedit
* Solution by niooss-ledger