part 4 nearby sonic and friends are still looking for more emeralds when shadow mario sneaks up on them and steals shadow and sonic's emeralds. Shadow mario runs off. Sonic and shadow are upset that mario would steal the chaos emeralds and sonic and shadow peruse shadow mario. The rest of the group don't think that is mario and chase after sonic and shadow at a clearing the two teams minus mario luigi sonic and shadow meet up and wonder where each other's team mate is. Over in another area. Mario and luigi have found sonic and shadow and vise versa. The four engage in battle.