Rock Band Unplugged is a rhythm game for the Sony PSP, developed by Harmonix in collaboration with Backbone Entertainment. It belongs to the Rock Band series, adopting the same music-playing simulation approach but modified for the portable platform. Players use the PSP's buttons to play along to scrolling notes on-screen, aiming to accurately perform songs across various rock genres by controlling different instruments like guitar, bass, drums, and vocals, though not simultaneously. The game features a career mode, character customization, and a soundtrack of hit songs from famed rock artists.