1st key - right before checkpoint2 you have to triangle jump to the right where there are lots of red fruits.

2nd key - go up slope behind checkpoint3 and home attack 3 beetles.

3rd key - roll under cage left of checkpoint3.

4th key - I think at the beginning of the game

5th key - skip the 2nd chaos emerald then while jumping down the big building next to the first helicopter there

Occasionally A G.U.N Soilder will state: "Mr.Yuji Naka Is alright." Yuji Naka Was the game's Executive Producer According to the credits.

At the start of the level it'll instantly shoot a fire ball at you. Dodge it. Kill one of the Black Arms on the ground, while dodging the Black Bull's fire waves. Grab the creature's guns and shoot it at the Black Bull's eye. DON'T shoot it again until the Black Bull is facing toward you. When you run out of ammo, get another gun(doh). When there are no more guns, use the Homing Attack, NOT the Jump Dash. Do it until you reach the Black Bull's eye. Repeat until you beat it. NOTE:Use Chaos Control when you can. ONLY use it HAVE A GUN. It freezes the Black Bull. You have unlimited ammo at that time.

At the Main Menu Press O O O O Triagle O Triagle Triagle O O O X If you enter it in correctly you will hear a gunshot.

If you have less than 50 Rings while you pass a Save Point, you earn an extra 10 Rings.

If you have 50-100 Rings while you pass a Save Point, you earn an extra 20 Rings.

If you have over 100 Rings while you pass a Save Point, you will get an extra life.

In Extra Mode, so you won't have to worry about how many lives you have, use the Egg Vacuum. Once the Egg Vacuum sucks 30 enemies, you will get three extra lives. If you keep using the Egg Vacuum early in the game on, you will not have to worry about starting all over from the beginning again.

There is a level where you have to hunt down Black Doom and use those switches to open or close doors. Find the black arms bat and shoot it. Once it's unconscious you can go over and fly on it's back. Fly to the arena where the huge spaceship forms. Round the edges are guns to destroy it. Even though you usually have to open the locked doors to climb up but, you have the bat so you don't need to. You don't even get stuck as you can climb up!

On the last story, when fighting devil doom the other characters talk to you. At five minutes in the fight gas will leak into their shelter and at 8 mins eggman will tell shasdow all about his life that he forgot he will stop at 10 mins because the gas has killed all the characters so you restart the fight after that.so you find out what has really happened

Complete the game in hero mode.

To beat the level with ease just keep getting chao control and skip alll ememies

Expert mode : Get an A ranking in all levels

Last story : Succesfully complete every sixth stage in story mode, defeat all Bosses at the end (all five hero and dark bosses),and see all ten storyline endings

Shadow rifle : Succesfully complete the Last story

Egg Vacuum : Succesfully complete the neutral storyline with the hero ending

Heal cannon : Succesfully complete the hero storyline

Omochao gun : Succesfully complete the semi-hero storyline

Samurai Blade : Succesfully complete the dark storyline

Satellite laser : Succesfully complete the semi-dark storyline

Level 2 weapons : Succesfully complete both the dark and the hero versions of the story

All hail shadow song : Succesfully complete the hero storyline

All of me song : Succesfully complete the Last story

Almost dead song : Succesfully complete the dark storyline

Chosen one : Succesfully complete the semi-hero storyline

Never turn back : Succesfully complete the dark storyline

To unlock expert mode, get an A rank in all stages.

112: A reclaimed heart (2 neutral,1dark,then rest neutral)
275:The reason I was born(hero,dark,hero,then rest neutral)
164:A new empires beginning(all neutral)