The overgrown islands are green islands in the middle of large bodies of water. Along the islands and in the water both purple and green plants and vines grow and stick up.
The only way you can navigate these islands is buy touching the single swaying white flower that will be somewhere on that island. Doing so you will hear a chime and be transported to another island.
- Nexus > Pipes and Phone Poles > Apartments 1 > Industrial Snow World > Plant Labyrinth (Past) > Plant Labyrinth > Ghost Garden 2 > Overgrown Islands
- Nexus > Neon World > Red and Blue path > Bone Maze > Red Body > Sewers 2 > Industrial Maze > Overgrown Islands
- Industrial Maze (by interacting with the orange symbol)
- Ghost Garden 2 (by interacting with the field of flowers and hearing a chime, leaving and touching the flower outside)