Most gigs end with an encore song that is not revealed until the other songs are completed.

It is the fourth main installment in the Guitar Hero series.

The game was launched in North America in October 2008 for the PlayStation 2, PlayStation 3, Wii, and Xbox 360 consoles, and a month later for Europe and Australia.

The game allows users to create new songs through the Music Studio mode, which can then be uploaded and shared through a service known as GHTunes.

World Tour expands beyond the core guitar-based gameplay by introducing the ability to play drums and sing vocals, and supports the ability for up to four players to play together in a virtual band through these different instruments.

Successfully hitting notes increases the players or bands score, as well as increase the Rock Meter that represents the songs performance.

Missed notes are not scored and negatively affect the Rock Meter.

If the Rock Meter drops too low, the song ends prematurely, with the virtual audience booing the band off stage.

Completing a consecutive series of notes successfully will increase a scoring multiplier for that player up to 4x.

This multiplier is doubled when the player activates star power.

Similar to Rock Band, the band shares a common score, scoring multiplier and band performance meter while each player has their own performance metric; the band also shares the same Star Power meter, though any player may activate it at any time.

A player that performs poorly and reduces their performance meter to zero can still continue to play, but they drain the overall performance meter for the band, requiring the other players to make up for this.

Successfully completing a song garners a three to five-star rating based on the accumulated score, and rewards such as in-game money that can be used to buy new guitars and outfits for characters.

As with previous Guitar Hero titles, the guitar and bass player must hold down the correct fret button(s) on the controller while strumming in time with the notes as they scroll on-screen.

One addition to the guitar gameplay is the ability to play notes while holding a sustained note.

Additionally, the bass guitar player is required to play notes representing an open E string, which is shown on-screen as a solid line across their note track.

To play these notes, the bass guitar player strums the controller without pressing any fret button keys.

The drum interface is similar to the guitars interface, with each on-screen note track equivalent to a colored drum head on the controller, with the bass drum indicated by a line across the note track.

The drum player only needs to hit the correct drum pads simultaneously to the note gems to successfully play their track.

There are also marked sections indicating drum fills wherein the player may play any notes they wish in a solo to gain points.

The vocal track requires the player to match the pitch of the notes in a manner similar to Karaoke Revolution to be successful.

Special sections of each players note track are marked with glowing notes, which, if completed successfully, builds up Star Power.

Once enough Star Power is accumulated, it can be released via various means to double the bands current score multiplier.

For guitar and bass, this is done by lifting the guitar controller vertically or (though not in bass) by pressing a button on the guitar face; for drums, by striking both cymbal pads on the controller at the same time; for vocals, by tapping the microphone or making a similarly quick sound.

Career mode has been slightly altered from previous Guitar Hero games.

After creating a band, selecting or creating an avatar, and then selecting an instrument, the player is then presented with one of several gigs containing two to five songs each.

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