Tropical Coast (トロピカルコースト Toropikaru Kōsuto) is the third world of Sonic Lost World. The Zone Zone 3 takes place in an entire underwater tube, where Sonic must grind on grind rails and avoid giant, mechanical eels that can defeat the hedgehog. Zone? uses the same background music as Sky Road Zone 1. 25 Jan Stream Sonic Lost World - Tropical Coast Zone Act 3 (Sea Bottom Segue)Music by Jean Oliveira from desktop or your mobile device.