

In 3D sections, running on water is a feature.

A Kao from Sonic Heroes also appears in Act 1, trying to crush Classic Sonic during the Act. Surfing was also hinted at as a power-up for either Classic or Modern Sonic in this stage, but this feature is not present in the final released game. There are also underwater portions making allusions to Hydrocity Zone and Labyrinth Zone. The Kaos from Ocean Palace returns in this level. This issue can be remedied for Classic Sonic if the player has the Aqua Shield equipped. As both Sonics can be underwater for good portions of the level, air bubbles are also back in this zone.

Classic Sonic, meanwhile, takes to the submarine underground in temple sections reminiscent of Hydrocity Zone and Labyrinth Zone and has to run away from giant spiked rolling stones towards the end. Modern Sonic speeds through this zone along looping alabaster highways and aquaplaning over the water as in Adabat, and may choose to either jump along the backs of giant turtles or drive a go-kart on a suspended road. It is exclusive to the PS3, Xbox 360 and PC versions. It also features "indoor" segments which take visual elements from Road Rock. This stage has some references to other stages, like Hydrocity Zone, Jungle Joyride, Ocean Palace and Labyrinth Zone.
