The 30 Natural Monsters, the 5 Core Seasonals and Jam Boree, Shugabush, and Wubbox can be placed on Gold Island. Only Monsters from the Natural Islands (except Wubbox and Jam Boree) can be placed on Gold Island.

Aux. Seasonals, Ethereals, Mythicals, Magicals, Werdos, Dipsters, Wublins and Celestials cannot be placed on Gold Island.

If you have a Natural Monster that did not originate from a Natural Island (Plant, Cold, Air, Water and Earth) then you will not be able to place it on Gold Island.