Flavzz, Yes you are correct in saying this. It's called Club Advantage. It's 6 clubs that each offer 3 games per year at an alternative club.
1- Blackwood
2- Flagstaff Hill
3- Mt Osmond
4- Riverside
5- Tea Tree Gully
6- The Vines
So if you joined Blackwood you would actually get 15 free games per year at the 5 other courses which is pretty awesome value!!!