 The player initiates a battle by touching Noise symbols; each symbol constitutes one round of battle.Selecting more than one Noise symbol at a time results in a multi-round battle (referred to in-game as multiple noise "reductions") that gradually increases in difficulty with each round, but conversely leads to greater rewards upon success.Altering the difficulty of the Noise and the amount of health for Neku and his partner also alter the benefits conferred.