This is a difficult battle if Sonic is not upgraded. Repeat the following three steps to defeat this boss; First, destroy the purple light powering the force field around it. Second, attack it quickly until he drops frozen nitrogen tubes. Finally, pick up the nitrogen tubes and throw them at the boss to freeze it. This makes a great opportunity to attack.
There’s a person in Mazuri who forgets what he eats at the guard tower. During the day, he will say that he loves the chocolate that Chip gives him. At night, he will say that he has never ate chocolate before, even if you change the time of day in Mazuri.
-First you'll play as the Gaia Colossus against Dark Gaia. When Dark Gaia opens his hands, hit him with two hands. You can also let him swing his arms and hit him after dodging. Keep hitting him with a normal punch until you finish him off. You'll then play as normal Sonic. Start running through the Gaia Colossus and dodge Dark Gaia's tentacles and bullet attacks. Run to the Speed Dash and hit the correct combination. You must do this three times, once per eye. Finally you will play as Super Sonic. Start collecting rings and attack Complete Dark Gaia's seven eyes. You need at least eleven rings to attack an eye so keep track of your ring count. Start hitting the side eyes and dodging the rocks that are ahead until he opens his middle eye. Attack the eye, look all around for flying rocks, and hit the last eye.
-Use the following strategy to dodge Complete Gaia's six hand attack. When playing as Super Sonic against Dark Gaia, he will try to slash you when he has all his small eyes open. He will then attack with all six claws. During this attack, go just under the big eye in the middle of the slash to a small square you can fit in. You will receive any damage. However, if you get hit, you will lose all your rings and fall into the lava.
Dark Gaia Phoenix will first fire feather arrows at you. Dodge them and quickly determine his next location to attack. Follow it and jump on the platform (pillar-type structure with a water barrel) nearby. To defeat him, wait until it’s done attacking and pick up a water barrel. Throw it directly at him when it hovers around the platform. Next, he will fly to the center of the battle arena. This is your opportunity to attack him while he rests. Repeat the process until he is defeated. Note: He’ll be more resistant to the water barrels the more he’s attacked.
Start by continuously charging at the boss and attacking him. Then, do a double jump when he swings his weapon. The axe will stun Sonic, allowing the boss to attack and inflict a heavy amount of damage. He might occasionally teleport across the battlefield to make a series of attacks. First, it will summon lightning to surround itself. It will then charge at you, causing a chain of attacks involving moving the Wiimote and Nunchuk Up and Down a few times.
When the Egg Dragon shoots ice and fire balls at you, run away from them. When it gets close to the rock field, jump and slice his power core (the light on his chest). Hit it repeatedly. When he starts swinging his sword, double jump to dodge it. Jump to avoid his ground stabbing attack.
When fighting Dr. Eggman's first robot, Beetle, collect the coins to dash him when he tries to pincer you. This fight consists of him releasing three boxes from a distance, which you can just run around, and then moving in close to pincer you. Jump, then dash in to him when this happens. Eventually a side view will appear. Beetle will begin on the right-hand side and fire three missiles. Their pattern depends on how their engines fire up so watch closely. He will then move to the middle of the screen and pincer attack once or twice. He will then move to your right again and try to pincer you. Jump, then look for the homing target and hit him.