Released September 1995 Nintendo asked Sony to develop a CD-ROM add-on called "PlayStation" for the SNES. Because Sony wanted 25% of all profits Nintendo earned from sales of this PlayStation and all PlayStation games, after Sony revealed that they were developing it, Nintendo instead went to Philips. This caused Sony to consider abandoning their research, however instead they used what they had developed so far and made it into a full blown console. This led to Nintendo filing a lawsuit claiming breach of contract and attempted, in U.S. federal court, to obtain an injunction against the release of the PlayStation, on the grounds that Nintendo owned the name. The federal judge presiding over the case denied the injunction.
The PlayStation was launched in Japan on December 3, 1994, the USA on September 9, 1995 and Europe on September 29, 1995. In America, Sony enjoyed a very successful launch with titles of almost every genre including Toshinden, Twisted Metal, Warhawk, and Ridge Racer. Almost all of Sony's and Namco's launch titles went on to produce numerous sequels.