 <unk> around each level map are gold rings , and collecting 100 rings rewards the player with an extra life . <unk> are a layer of protection against <unk> ; if Sonic has at least one ring when he <unk> with an enemy ( or obstacle ) , he will survive . However , all his rings will be scattered ; they will <unk> and disappear in a few seconds if they are not picked up again . If Sonic is hit without any rings , he loses a life . Although shields and temporary <unk> may be collected to provide additional protection , certain <unk> ( such as drowning , being crushed , falling down a <unk> pit or running out of time ) will cost Sonic a life regardless of rings or other protection . 
