Robonik is out to collect the 7 Chaos Emeralds in order to rule the world, and your mission is to find all the Emeralds before he does. It is an action and adventure game developed by Sega where you will help Sonic the Hedgehog complete missions in order to save the world from his arch nemesis’ evil plans. Softonic review Help Sonic save the worldĮveryone’s favorite hedgehog is back in Sonic Adventure DX.