RockFree was a browser-based 2D rhythm game from Acclaim. Players could create a rocker and play along to match the notes in a Guitar Hero style with a selection of tracks. Cover versions of popular songs from several decades were available, and players were able to have three tracks in their library at any given time. In addition to solo mode, RockFree also allowed players to compete against others for dominance in rock battles of up to eight. The game's upload system let players upload their own tracks to play along with, even letting others try them out. RockFree was free-to-play with microtransactions available.