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Altitude Limit Zone is a level on Sonic Rush. It is Sonic's sixth level and Blaze's fifth level. It takes place on some kind of fortress, the level is mostly made up of rails, which can be used to grid down to progress further in the level. There is always instant death if you fall to the bottom in the form of insta-kill lasers. There are parachutes that the heroes must use to glide down, and a 3D hangliding segment in both acts as well.