Studio Pixel Fanpage 洞窟王　 ＰＣ・るなら洞窟物語
A fan site containing the Cave Story soundtrack, cd cover art, beta music, ringtones, challenge videos, and a guide to Sacred Grounds. 洞窟物語改造版 Jenka's Nightmare をお勧めするサイト
A fan site for the Jenka's Nightmare mod. 洞窟物語 Doukutsu Monogatari
Chinese fan site for Cave Story, hosts the Chinese (Traditional) translation for Cave Story.