 games such as "Jump 'n bump", "Meritous", "Warzone 2100", "HoverRace" and "Abuse" have even been entirely released freely, including multimedia assets and levels.Some games are mostly free software but contain some proprietary content such as the "Cube" sequel, "" or the former "Quake III Arena" mod "Smokin' Guns", but some developers desire and/or work on replacing these with free content.Primarily proprietary developers have also helped free gaming by creating free libraries.