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
Philips CD-i Philips encouraged MS-DOS and console developers to create games, introduced a $250 peripheral with more memory and support for full-motion video, and added to new consoles a second controller port for multiplayer games. The attempts to develop a foothold in the games market were unsuccessful, as the system was designed strictly as a multimedia player and thus was under-powered compared to other gaming platforms on the market in most respects. Earlier CD-i games included entries in popular Nintendo franchises, although those games were not developed by Nintendo. Specifically, a "Mario" game (titled "Hotel Mario"), and three "Legend of Zelda" games