Fire Souls are collectibles that appear throughout Sonic and the Secret Rings. There are a total of 126 souls in the game. Fire Souls resemble red Rings on fire with a small column of fire in the center. One could say that the Fire Souls act similarly to Red Star Rings that were introduced in Sonic Colors.
Three Fire Souls are in each 1st, 2nd, 5th, 6th, 9th, and 10th missions in each world (not counting Lost Prologue). Collecting these unlock games, characters, and other features in Party Mode: