Mattel Electronics built a state of the art voice processing lab to produce the phrases used in Intellivoice games. However, the amount of speech that could be compressed into an 8K or 12K cartridge and still leave room for a game was limited. Intellivoice cartridges "Space Spartans" and "B-17 Bomber" did sell about 300,000 copies each, priced a few dollars more than regular Intellivision cartridges. However, at $79 the Intellivoice did not sell as well as Mattel expected, and Intellivoices were later offered free with the purchase of a Master Component. In August 1983 the Intellivoice system was quietly phased out. A children's title called "Magic Carousel", and foreign language versions of "Space Spartans" were completed but shelved. Additional games "Woody Woodpecker" and "Space Shuttle" went unfinished with the voice recordings unused.