Buoy

Buoys are gimmicks that appeared in Sonic Unleashed''. ''It is a small floating rover on water that marks the borders of an area of water.

Description
Buoys are brown smaller objects float on water in big groups surrounding a specific area. They are usually seen in section of stages that have a lot of water to direct the player to the right way in most cases, but sometimes they are to help against enormous water badniks.

Sonic Unleashed
In Sonic Unleashed, it appeared in stages with enormous water like Chan-nun daytime stages to make the player know which direction he has to follow, passing out of them will not do anything, but losing the ability to determine the right direction.

Sonic Generations
In Sonic Generations, they have different role. If the player gets out of the area that surround, the Big Chopper will track him down and knock him down from water causing him to lose one life. They are only seen in Seaside Hill.