In addition to the original features, the game includes a multiplayer mode, allowing for competitive cooperative play.[1] This mode, suggested by Pete Maguire of the Harmonix team and added late in development, allows two teams, either 2v2 or 3v1, to play through a song without fail, taking into account the player difficulty levels among all players.[2] The game also includes a FreQuency mode, where the semi-flat track layout can be switched to the tunnel style used in the original FreQuency.[3] Harmonix developed a new game engine, Forge, which was also used to develop Rock Band 4, for the reboot.