Original: Katamari Damacy inspired the development of other video games, and led to the release of four sequels in Japan and other territories: We Love Katamari, Me & My Katamari, Beautiful Katamari, and I Love Katamari, and to a fifth sequel, Katamari Forever, to be released late 2009.
Simplified: It's had many sequels, including We Love Katamari, Me & My Katamari, and Beautiful Katamari.