seven spheres on the roof

Kushina walks into the room and sees seven colored spheres on the roof of the room. the color spheres were red, orange, yellow, green, blue indigo, and violet. each sphere had a cord attached to them that if she stood on her tip toes she could reach them. looking around the room she didn't see anything else except for the next door and the keypad.

"well done kushina you are at the halfway to the other side of the rainbow," said the voice. "for this room i'm sure you have noticed the spheres. Inside one of them is the key seal for one of your next restraint. however inside the others are a variety of other goods from a time penalty to well I leave it as a surprise. choose wisely my dear."

kushina spent a moment to look at the spheres and figure out which one she should choose first.