NHL 2K is a series of hockey games from 2K. Below is a list of games in the series and platforms they were released on.
NHL 2K: Dreamcast
NHL 2K2: Dreamcast
NHL 2K3: PlayStation 2, Xbox, Gamecube
ESPN NHL Hockey: PlayStation 2, Xbox
ESPN NHL 2K5: PlayStation 2, Xbox
NHL 2K6: Xbox 360, PlayStation 2, Xbox
NHL 2K7: PlayStation 3, Xbox 360, PlayStation 2
NHL 2K8: PlayStation 3, Xbox 360, PlayStation 2
NHL 2K9: PlayStation 3, Xbox 360, PlayStation 2, Wii
NHL 2K10: PlayStation 3, Xbox 360, PlayStation 2, Wii
NHL 2K11: Wii, iPhone
NHL 2K12 was cancelled in May of 2011, ending the franchise indefinently.