Project SEKAI COLORFUL STAGE! feat. Hatsune Miku, often shortened and referred to as Project SEKAI, is a mobile rhythm game developed by SEGA, Colorful Palette, Craft Egg, and Crypton Future Media. The game includes five new musical groups that collaborate with your favorite classic VOCALOID artists, such as Miku, LEN & RIN, KAITO, and more! Journey to SEKAI with these new and familiar faces to sing some of your favorite VOCALOID songs, such as ROKI, or The World is Mine!