The cache is NOT at the published coordinates, but is not far off of the Nine Tree (Terrain) Trail, and will be tricky to retrieve.
Disclaimer: This cache is not for EVERYONE
Add the minutes to S31º 's' E151 'e' 
Rules:
1. You need to have found ALL 81 combinations of the Difficulty / Terrain ratings.
2. All your finds have to have been found in one state or territory of Australia - one of the 6 states or 2 main Territories.
3. There is NO time limit pre-requisite.
4. Included in your 81 finds you have to have found at least seven different Types of caches. See list below.
Types of caches: CITO Event, EarthCache, Event Cache, Letterbox Hybrid, Multi Cache, Traditional Cache, and Unknown Cache. 
5. There are 4 'Wildcard' options which you can use for D/T combinations that are outside your nominated State. This could be a lifesaver for some. 
6. In your "Found it" log you will need to, a) first of all Declare you State / Territory, b), list all of the x 81 caches that qualify for this Challenge, by following (c), the following format: GC code (preferably a live link), Cache Type (so that we can see that you have found at least x 7 different Types), Cache Name, Difficulty / Terrain rating, and Date Found; include the State if that is different to your Declared State. And, d) if, and where you had to use any Wildcards.
(An alternate way for Premium Members would be to create a Public Bookmark list)
(If you have filled your D/T grid up from a variety of States then there is the Challenge cache in Victoria "Project 81 Master Challenge", GC4T46Q, that has no restrictions apart from having filled the grid up, that you would want to look for.)
| State |
Count |
| ACT |
|
| NSW |
3 |
| NTerritory |
|
| Qld |
4 |
| SA |
|
| Tas |
|
| Vic |
1 |
| WA |
|
*Fizzy Challenge: A Challenge Cache that requires the cacher to find and log one of each combination of the Terrain and Difficulty ratings, a total of 81 caches, in order to complete the challenge. Sometimes called a Fizzy Square; from GC11E8N – Well Rounded Cacher (The Fizzy Challenge), the original Fizzy Challenge cache, which was placed in California by Kealia> to honour the cacher FizzyMagic, who has given much to the “local caching community” better known as the San Francisco Bay area.
First to Find prize:
For the FIRST to Find cacher there are 3 different Trackables, and for the Second to Find cachers there is two different Trackable items to be retrieved. Hopefully each of the first 10 finders will also have a Trackable.
CONGRATULATIONS: pprass - for FIRST to FIND;
Marcus Vitruvius - FTF without any Wildcards