Challenge! is the debut album by Japanese rock band Flower Travellin' Band, then called Yuya Uchida & The Flowers, released in 1969. It features mainly cover songs, and was a means for Yuya Uchida to explore the emerging psychedelic rock movement outside his own career, and to introduce the work of upcoming Western bands such as Cream, Janis Joplin, Jimi Hendrix, Jefferson Airplane to a Japanese audience.