Shadow The Hedgehog - Expert mode

Last Story:
Successfully complete every sixth stage in story mode, defeat all Bosses at the end all five Hero and all five Dark Bosses, and see all ten Hero and Dark story line endings.

Egg Vacuum:
Successfully complete the Neutral story line with the Hero ending.

Use the Egg Vacuum to suck up 20 objects enemies, etc. to gain an extra life.
Krystal Tysias.

Heal Cannon:
Successfully complete the Hero story line.

Omochao Gun:
Successfully complete the Semi Hero story line.

Samurai Blade:
Successfully complete the Dark story line

Satellite Laser:
Successfully complete the Semi Dark story line

Shadow Rifle:
Successfully complete the Last Story.

Level 2 weapons:
Successfully complete both the Hero and Dark versions of a story line.

All Hail Shadow song:
Successfully complete the Hero story line.

All Of Me song full version:
Successfully complete the Last Story.

Almost Dead song:
Successfully complete the Dark story line.

Chosen One song:
Successfully complete the Semi Hero story line.

Never Turn Back song:
Successfully complete the Dark story line.

Library sequences:
Complete the indicated path of story mode missions to unlock the corresponding intermission sequences at the Library.

1: Punisment, Thy Name Is Ruin: Dark, Dark, Dark, Dark, Dark, Dark, Dark final Boss
2: Prologue To World Conquest: Dark, Dark, Dark, Dark, Dark, Dark, Hero ending
3: The March To A Darker World: Dark, Neutral, Dark, Neutral, Hero, Dark
5: Purification Via Ruination: Dark, Dark, Dark, Hero, Dark, Dark ending
6: Apogee Of Darkness: Dark, Dark, Dark, Hero, Dark, Hero ending
7: True Soldier Of Destruction: Dark, Dark, Dark, Hero, Neutral, Dark ending
8: Believe In Yourself: Dark, Dark, Dark, Hero, Neutral, Hero
11: Revenge At Last: Dark, Dark, Neutral, Dark, Dark, Dark ending
15: The Nightmare's Insulation: Dark, Dark, Neutral, Neutral, Dark, Dark ending
16: The Nightmare's Sublimation: Dark, Neutral, Neutral, Neutral, Dark, Hero
17: The Loner's Choice: Dark, Dark, Neutral, Neutral, Neutral, Dark
18: Subjugation IN BLACK: Dark, Neutral, Neutral, Neutral, Neutral, Neutral
27: The Cleansing of Darkness: Dark, Dark, Hero, Dark, Dark, Dark
45: The World's Demise: Dark, Hero, Dark, Dark, Dark, Dark ending
48: Vainglory or Abandonment?: Dark, Hero, Dark, Dark, Neutral, Hero ending
51: Controller from the Capsule: dark, hero, dark, neutral, neutral, dark
52: Beyond One's Own Power...: Dark, Hero. Dark, Neutral, Neutral, Good.
57: Transcendentalism: Dark, Hero, Dark, Hero, Neutral, Dark.
78: Power Of Love: Dark, Hero, Neutral, Hero, Hero, Hero
80: Walk My Way: Dark, Hero, Hero, Dark, Dark, Hero ending
91: The Rise and Fall Of The ARK: Dark, Hero, Hero, Hero, Dark, Dark
98: Severed Chains: Neutral, Dark, Dark, Dark, Hero, Hero.
102: Arriving At The Ego: Neutral, Dark, Dark, Hero, Neutral, Hero ending
105: Demise Wrought by Tragedy: Neutral, Dark, Neutral, Dark, Dark, Dark
111: Soldier Of Grief: Neutral, Dark, Neutral, Neutral, Neutral, Dark ending
112: Reclaimed Heart: Neutral, Dark, Neutral, Neutral, Neutral, Hero
120: Spawn Of The Devil: Neutral, Dark, Dark, Hero, Hero, Hero ending
121: Black Doom's Scheme: Neutral, Dark, Hero, Dark, Dark, Dark ending
135: A Vow For The Victims: Neutral, Dark, Hero, Hero, Neutral, Dark
144: One To Succeed A God: Neutral, Neutral, Dark, Neutral, Dark, Hero ending
145: Disappointed In Humanity: Neutral, Neutral, Dark, Neutral, Neutral, Dark
146: Faith Taken From Solitude: Neutral, Neutral, Dark, Neutral, Neutral, Neutral, Hero final Boss
153: Together With Maria...: Neutral, Neutral, Dark, Hero, Hero, Dark ending
154: The Tragedy's Conclusion: Neutral, Neutral, Neutral, Dark, Hero, Hero, Hero ending
155: The Day That Hope Died: Neutral, Neutral, Neutral, Dark, Dark, Dark
159: At Least, Be Like Shadow...: Neutral, Neutral, Neutral, Dark, Hero, Dark
160: Seeking A Silent Paradise: Neutral, Neutral, Neutral, Dark, Hero, Hero
161: The Lion's Awakening: Neutral, Neutral, Neutral, Neutral, Dark, Dark ending
162: Identity: Neutral, Neutral, Neutral, Neutral, Dark, Hero ending
163: An Android's Rebellion: Neutral, Neutral, Neutral, Neutral, Neutral, Dark
164: A New Empire's Begining: Neutral, Neutral, Neutral, Neutral, Neutral, Neutral, Hero final Boss
165: Bullets From Tears: Neutral, Neutral, Neutral, Neutral, Hero, Dark ending
166: Journey To Nihility: Neutral, Neutral, Neutral, Neutral, Hero, Hero
168: Dr. Eggman's Miscalculation: Neutral, Neutral, Neutral, Hero, Dark, Hero
170: Requiem For The Heavens: Neutral, Neutral, Neutral, Hero, Neutral, Hero ending
171: Sonic Dethroned: Neutral, Neutral, Neutral, Hero, Hero, Dark
175: Farewell To The Past: Neutral, Neutral, Hero, Dark, Neutral, Dark ending
182: Compensation For A Miracle: Neutral, Neutral, Hero, Neutral, Neutral, Neutral, Hero final Boss
191: Dark Soldier: Neutral, Hero, Dark, Dark, Neutral, Dark.
195: Birth Of The Dark Soldier: Neutral, Hero, Dark, Neutral, Dark, Dark
203: Perpetual Voyage: Neutral, Hero, Dark, Hero, Neutral, Dark
215: Wandering For Eternity: Neutral, Hero, Neutral, Neutral, Neutral, Dark ending
216: At Vagrancy's End: Neutral, Hero, Neutral, Neutral, Neutral, Hero ending
220: The Importance of Truth: Neutral, Hero, Neutral, Hero, Neutral, Hero ending
225: Solitary Journey: Neutral, Hero, Hero, Dark, Neutral, Dark.
228: I Shall Be The One To Judge: Neutral, Hero, Hero, Dark, Hero, Hero ending
229: Gone With The Darkness: Neutral, Hero, Hero, Neutral, Neutral, Dark
230: The Ultimate Choice: Neutral, Hero, Hero, Neutral, Dark, Hero
231: I Am The Strongest: Neutral, Hero, Hero, Hero, Hero, Dark ending
232: Justice's Awakening: Neutral, Hero, Hero, Hero, Hero, Hero ending
259: A Heart Bound To The ARK: Hero, Dark, Neutral, Neutral, Hero, Dark ending
262: Steel Combat Boots: Hero, Dark, Neutral, Hero, Dark, Dark ending
263: Protector Of The Ashen Moon: Hero, Dark, Neutral, Hero, Neutral, Dark ending
266: I Know The Will Of Heaven: Hero, Dark, Neutral, Hero, Hero
275: The Reason You Were Born: Hero, Dark, Hero Neutral, Neutral, Dark
276: The Dark Part Of The Galaxy: Hero, Dark, Hero, Neutral, Neutral, Hero.
282: Beloved Memories: Hero, Dark, Hero, Hero, Hero, Hero
283: Birth Of A Devil: Hero, Hero, Dark, Dark, Dark, Dark
291: The Doctor's Lie: Hero, Hero, Dark, Neutral, Neutral, Dark
309: Funeral Procession In Space: Hero, Hero, Neutral, Neutral, Neutral, Dark
316: The One Who Maria Entrusted: Hero, Hero, Hero, Neutral, Hero, Hero
317: A.1's Enlightenment: Hero, Hero, Hero, Hero, Neutral, Dark, Dark ending
318: A Dying Empire's Cry: Hero, Hero, Hero, Dark, Dark, Hero
320: Tear-Soaked Hometown: Hero, Hero, Hero, Dark, Neutral, Hero ending.
321: Sparks On The Horizon: Hero, Hero, Hero, Dark, Hero, Dark ending
322: A Use For A Saved Life: Dark, Neutral, Dark, Hero, Dark
323: Coffin Of Memories: Hero, Neutral, Hero, Neutral, Dark, Dark
324: The Self-Imposed Seal: Hero, Hero, Hero, Hero, Neutral, Hero
325: Pretense in the Mirror: Hero, Hero, Hero, Hero, Hero, Dark
326: A Missive From 50 Years Ago: Hero, Hero, Hero, Hero, Hero, Hero, Hero final Boss

Two player mode:
Use controller two to play as the Hero characters, such as Sonic, Tails, Knuckles, etc. This does not work with Doom's Eye. It also works with Maria. Note: They cannot pick up guns.

Character choices:
In just about all of the stages you have three choices: to help the Dark side, yourself, or the Hero side whenever you have someone with you and it is not a Boss fight. To change the character you want with you, press Start. There will most likely be three selections: Dark, Neutral, and Hero. Press Left or Right to highlight a character or ring in the middle. Press X to select the highlighted character. That character will remain with you until your next run in with the other character. You can then simply press Start and do the process again. Note: You cannot select a Hero partner if there is an "X" over the Hero side. You cannot select a Dark partner if there is an "X" over the Dark side.

Another way to do this is to use the D-Pad on the controller during the game. Press Right for the Hero character, Left for the Dark character, and Down for the Neutral character.

Yuji Naka reference:
Sometimes the GUN soldiers will say odd things. One of the things that they say is "Mr. Yuji Naka is all right." Yuji Naka is the creator of the Sonic series.

Fall through floor:
On the stage where you first see Gloria on the space station you will fall through the floor after you get very far in the level. This happens in one of the hallways between rooms.