Sonic and Shadow play fast-paced levels, emphasizing platforming. Their homing attack can lock onto robots created by Eggman and G.U.N., and they can grind on rails. Tails' and Eggman's levels are slower and oriented towards multi-directional shooting; they are confined to mechs in which they can jump short heights, hover and shoot enemies. Knuckles' and Rouge's levels are open and feature action-adventure gameplay with treasure hunting; in each level, they must find three shards of the Master Emerald. Their search is guided by radar and puzzle-based clues from harmless robots. Knuckles and Rouge can glide, defeat enemies with punches and kicks, and scale walls, digging into them to find power-ups.