This version required much relearning for users of older Cubase versions. It contained all downloadable content from the original versions. Numerous unofficial computer versions and variants of the game are available. There are some differences between these versions and the original cartridge versions. Both versions were different from the versions eventually released. The levels differ between the different console versions. A number of generic versions are available. No known earlier versions of it exist. Several public beta versions of the SDK were released. The DOC files created with Microsoft Word versions differ. Business class comes in many different versions. The scoring is similar for both versions. The differences between these versions are significant. Video games are playable on various versions of iPods. AT&T continued to issue licenses for older Unix versions.