[Cancelled] Challenge as an 81-matrix bonus

Hello,
We are the owner of an 81-matrix and would like to have a challenge as a bonus cache.
Condition should be to find all caches of this matrix and to have logged.
Since the matrix is ​​not yet published (but the listings are already created), we can only communicate the corresponding GC codes by PM.
Thank you for your support.

Volunteer Reviewer here.

You can have a challenge cache that requires a cache find in each of the 81 D/T grids -- ANY cache, whether or not part of your series.

You cannot have a challenge cache that requires finding the 81 specific caches in your series.

You could design a "series bonus cache" -- for example, by hiding portions of the coordinates in the containers for the series of 81 caches. But, that bonus cache cannot use a Project-GC challenge checker.

Specifically, this is disallowed by guideline 11: Specific Lists http://support.groundspeak.com/index.php?pg=kb.page&id=206#specificLists

You should be able to do this outside the challenge system.

Have an offset in each of the 81 caches in the coordinates and when you find them all you have enough information to compute the final location. It requires some more work when placing caches but is a way to do the bonus consistent with what The Leprechauns suggests.

Good luck in your quest and thanks for placing the caches.