Angel Island Zone is the fifth zone in Sonic Advance. This zone is named after Sonic the Hedgehog 3's Angel Island Zone but designed after Sonic & Knuckles' Sky Sanctuary Zone, as it's an ancient ruins-themed level with plant life covering the stone structure partially. It is also similar as it has clouds which you bounce off of when hit and causes your character to rotate in the same manner as in Sonic 3.
This zone does have its own features not seen in the original Sky Sanctuary Zone. For instance, there are indoor sections with old contraptions such as rolling balls that the player must run on the make them move, as well as overhead rails and hanging handles that elevate the player when used. There are also sand slides and sand waterfalls like those seen in Sandopolis Zone, and S-tubes like those seen in Green Hill Zone and Hill Top Zone.
The difficulty of the game really picks up on this level as there are many places where you can fall to your death.