The primary component of this content resource is an online activity in which students "drag" moons to their correct places in lunar cycles. There are calendars that include illustrations of the phases of the moon for most days, and the challenge is for students to complete the calendars by filling them with the correct moon phases for all days. A child's voice narrates the activity, providing students with ongoing feedback and guidance (e.g., Well done! and Check for a pattern.). There are three levels in this Lunar Cycle Challenge, and after students successfully complete all three levels they can print out a certificate of completion. (author/ts)