At Play Vol. 3
 At Play Vol. 3 is a compilation album from the Canadian progressive house musician deadmau5 and the third of the At Play series. Like the previous At Play albums this album consists of 10 Full Length DJ Friendly Tracks as it says on the sleeve. Half of the tracks are from his 2006 album Vexillology and the last two are singles from 2007. The tracks Cyclic Redundancy and Templar were previously released on the 2007 EP Full Circle.