The Nintendo DS version of Lego Rock Band is similar to the PlayStation Portable game Rock Band Unplugged and the Nintendo DS version of Rock Band 3. During each song, the player switches between the various instruments, trying to keep all four members of the band "happy"; this is done by successfully completing a series of notes for the specific instrument, and then correctly hitting a final, purple note to increase that band member's happiness. Band members' happiness will fall over time, requiring the player to continually switch between band members to maintain the band's overall mood and score multiplier.[5] The game uses the touchpad, stylus, and face buttons of the DS, and does not require or support additional peripherals like the console versions do.[6] Up to four people can play at a time, each using a separate DS and playing their own instrument.[5]