16-19. Sargasso - four bolts

Bolt 1
The first Gold Bolt on Sargasso is visible just after you've gotten through the Gelatonium plant and emptied your Gelanator. Float down to the ground and head to the left - here's where to find it once you're there:

Bolt 2
Sargasso's next bolt is just sitting out in the open, waiting for you to claim it - but you won't be able to until you can use the Robo-Wings to freely soar around the level. Once you can, just fly straight ahead from the launch pad at the beginning of the level, until you reach the Kerchu drilling platform. The bolt is on a big square platform, guarded by just a couple of angry-looking Kerchu.

Bolt 3
This bolt is rare in that it actually takes careful timing and a little patience to find. Engage your Robo-Wings at the launchpad near the beginning of the level, follow the rings of light (as seen in the video) through the tunnel and land near the giant four-footed dinosaur on the other side. You'll need to trip three red switches here; one is in plain sight, and the other two are under our lizard friend's hind feet, which he'll lift in a specific order. Check the video below to find out what it is:

Bolt 4
Hit the launch pad near the level's beginning one last time, and then immediately hang a left, a right and another left. Coast straight ahead for a little bit, and you'll soon run into another huge, four-footed dinosaur; the Gold Bolt is hiding up on his back.