Philips CD-i console, also known as Green Book, which was co-developed by Philips and Sony. In addition to games, educational and multimedia reference titles were produced, such as interactive encyclopedias and museum tours, which were popular before public Internet access was widespread. The CD-i was also one of the earliest game systems to implement Internet features, including subscriptions, web browsing, downloading, e-mail, and online play. This was facilitated by the use of an additional hardware modem and "CD-Online" disc (renamed Web-i in the US), which Philips initially released in Britain in 1995 for $150 US. Development of the CD-i format began in
CD-i games from The Legend of Zelda series out to independent studios, Philips subsequently used the characters to create three games for the CD-i, with Nintendo taking no part in their development except to give input on the look of the characters based on the artwork from Nintendo's original two titles and that of their respective instruction booklets. Philips insisted that the development studios utilize all aspects of the CD-i's capabilities including FMV, high-resolution graphics, and CD-quality music. Because the system had not been designed as a dedicated video game console, there were several technical limitations, such as laggy controls (especially for the standard infrared controller), and numerous