Based on the animated series, Beyblade: Metal Fusion for nintendo DS revolves around tournament battles fought with special spinning-top "blades." Blades are revved up and let loose, to crash and rebound around a fighting area, which is often walled or bowl-shaped to keep the tops returning to the center for additional collisions. The player with the last in-bounds top spinning is the winner. As in the cartoon series (and the corresponding Hasbro toy line), each top is assembled from five basic parts, which combine for a particular shape, weight, center of gravity, and tip friction. Victory calls for strategic planning, as before a match, players can equip their blades with different parts to for enhanced offensive or defensive attributes.