<P>The <I>Action Replay</I> button is used to activate cheats in certain GBA games. For example, in <I>Batman Vengeance</I>, pressing the <I>Action Replay</i> button activates the Slow Motion mode, and in <I>Harry Potter and the Prisoner of Azkaban</I>, it brings up the Debug Menu and Test Maps. These enhancements are achieved with the <I>Action Replay</I> button as you might not want them active throughout your game.</P>