 The four difficulty levels for each song afford the player a learning curve in order to help him / her progress in skill . The first difficulty level , Easy , only focuses on the first three fret buttons while displaying a significantly reduced amount of notes for the player to play . Medium introduces the fourth ( blue ) fret button , and Hard includes the final fret button while adding additional notes . The addition of the orange fret button forces players to move their fingers up and down the neck . Expert does not introduce any other frets to learn , but adds more notes in a manner designed to challenge the player and to simulate the player 's hands to move in a sequence similar to a real guitar . A difficulty added in World Tour is Beginner , which only requires the player to strum to the basic rhythm ; holding the fret buttons becomes unnecessary . Another new difficulty only for drums was added to Metallica known as Expert + , which uses the double bass pedal . 
 The four difficulty levels for each song afford the player a learning curve in order to help him / her progress in skill . The first difficulty level , Easy , only <a href='uninflect' title='1'><mark>focuses</mark></a> on the first three fret buttons while displaying a significantly reduced amount of notes for the player to play . Medium <a href='uninflect' title='2'><mark>introduces</mark></a> the fourth ( blue ) fret button , and Hard <a href='uninflect' title='3'><mark>includes</mark></a> the final fret button while adding additional notes . The addition of the orange fret button forces players to move their fingers up and down the neck . Expert <a href='uninflect' title='4'><mark>does</mark></a> not introduce any other frets to learn , but <a href='uninflect' title='5'><mark>adds</mark></a> more notes in a manner designed to challenge the player and to simulate the player <a href='null_genetive' title='6'><mark>'s</mark></a>hands to move in a sequence similar to a real guitar . A difficulty added in World Tour is Beginner , which only <a href='uninflect' title='7'><mark>requires</mark></a> the player to strum to the basic rhythm ; holding the fret buttons <a href='uninflect' title='8'><mark>becomes</mark></a> unnecessary . Another new difficulty only for drums was added to Metallica known as Expert + , which <a href='uninflect' title='9'><mark>uses</mark></a> the double bass pedal . 
The four difficulty levels for each song afford the player a learning curve in order to help him / her progress in skill . The first difficulty level , Easy , only focus on da first three fret buttons while displaying a significantly reduced amount of notes for the player to play . Medium introduce the fourth ( blue ) fret button , and Hard include the final fret button while adding additional notes . The addition of the orange fret button forces players to move their fingers up and down the neck . Expert do not introduce any other frets to learn , but add more notes in a manner designed to challenge tdaplayer and to simulate thdalayer  hands to move in a sequence similar to a real guitar . A difficulty added in World Tour is Beginner , which only require the player to strum to the basic rhythm ; holdin the fret buttons become unnecessary . anotha new difficulty only fa drums was added to Metallica known as Expert + , which use the double bass pedal .