Shadow The Hedgehog
Hidden Key Locations Guide
Get an "A" rank in all stages to unlock Expert mode.
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 to unlock the Last Story.
Successfully complete the Last Story to unlock the Shadow Rifle.
Successfully complete the Neutral storyline with the Hero ending to unlock the Egg Vacuum. Use the Egg Vacuum to suck up 20 objects (enemies, etc.) to gain an extra life.
Successfully complete the Hero storyline to unlock the Heal Cannon.
Successfully complete the Semi Hero storyline to unlock the Omochao Gun.
Successfully complete the Dark storyline to unlock the Samurai Blade.
Successfully complete the Semi Dark storyline to unlock the Satellite Laser.
Successfully complete both the Hero and Dark versions of a storyline to unlock the Level 2 weapons.
Successfully complete the indicated task to unlock the corresponding song:
- Air Fleet Theme: Play the Air Fleet level.
- All Of Me: Successfully complete the Last Story.
- All Hail Shadow: Successfully complete the Hero story line.
- Almost Dead: Successfully complete the Dark story line.
- Black Bull Boss Theme: Defeat Black Bull.
- Black Comet Theme: Play the Black Comet level.
- Black Doom Boss Theme: Defeat Black Doom.
- Central City Theme: Play the Central City level.
- Chosen One: Successfully complete the Semi Hero story line.
- Circus Park Theme: Play the Circus Park level.
- Cosmic Fall Theme: Play the Cosmic Fall level.
- Cryptic Castle Theme: Play the Cryptic Castle level.
- Death Ruins Theme: Play the Death Ruins level.
- Devil Doom Boss Theme: Defeat Devil Doom.
- Diablon and Sonic Boss Theme: Defeat those Bosses.
- Digital Circuit Theme: Play the Digital Circuit level.
- Egg Breaker Boss Theme: Defeat Egg Breaker.
- Egg Dealer Theme: Defeat Egg Dealer in the Neutral story line.
- Ending: Defeat Devil Doom.
- Event 1 Theme: Listen to the Event 1 Theme in Story mode.
- Event 2 Theme: Listen to the Event 2 Theme in Story mode.
- Event 3 Theme: Listen to the Event 3 Theme in Story mode.
- Event 4 Theme: Listen to the Event 4 Theme in Story mode.
- Final Haunt Theme: Play the Final Haunt level.
- Glyphic Cannon Theme: Play the Glyphic Cannon level.
- Gun Fortress Theme: Play the Gun Fortress level.
- Heavy Dog/Blue Falcon Remixed Boss Theme: Defeat those Bosses.
- Iron Jungle Theme: Play the Iron Jungle level.
- Lava Shelter Theme: Play the Lava Shelter level.
- Lethal Highway Theme: Play the Lethal Highway level.
- Lost Impact Theme: Play the Lost Impact level.
- Mad Matrix Theme: Play the Mad Matrix level.
- Never Turn Back: Successfully complete the Last Story in the Dark story line.
- Prison Island Theme: Play the Prison Island level.
- Sky Troops Theme: Play the Sky Troops level.
- Space Gadget Theme: Play the Space Gadget level.
- The Ark Theme: Play The Ark level.
- The Doom Theme: Play The Doom level.
- The Final Way: Play The Final Way level.
- Waking Up: Successfully complete the Neutral story line.
- Westopolis Theme: Play the Westopolis level.
- All Of Me: Successfully complete the Last Story.
Collect all five hidden keys in the indicated level to unlock the corresponding bonus behind the five-keyed doors:
- Air Fleet: Air Saucer
- Black Comet: Two Turrets
- Central City: Air Saucer
- Circus Park: Extra shooting gallery
- Cosmic Fall: Switch that makes ring trails to the end of the level
- Cryptic Castle: Shortcut
- Death Ruins: Warp Portal
- Digital Circuit: Warp Portal
- Final Haunt: Turrets
- Glyphic Canyon: Black Arm's Vehicle
- GUN Fortress: Military Vehicle
- Iron Jungle: Tank Cannon
- Lava Shelter: Air Saucer
- Lethal Highway: Large GUN Cannon
- Lost Impact: GUN Vehicle
- Lost Impact: Armored Car
- Mad Matrix: Alternate path to red terminal
- Prison Island: Tank Cannon
- Sky Troops: Black Arm's Vehicle
- Space Gadget: Warp Hole
- The ARK: Three extra lives
- The Doom: Open cage to shortcut to the end of the level
- The Last Way: Warp Portal
- Westopolis: Armored Car
- Black Comet: Two Turrets
Successfully complete the indicated path of Story mode missions to unlock the corresponding intermission sequence at the Library:
- 1: Punishment, 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
- 4: The Ultimate Ego: Dark, Dark, Dark, Dark, Hero, Hero
- 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
- 9: An Android's Determination: Dark, Dark, Dark, Hero, Hero, Dark
- 10: For Machine, By Machine...: Dark, Dark, Dark, Hero, Hero, Hero
- 11: Revenge At Last: Dark, Dark, Neutral, Dark, Dark, Dark ending
- 12: Ego's Awakening: Dark, Dark, Neutral, Dark, Dark, Hero
- 13: Destruction and Scorn: Dark, Dark, Neutral, Dark, Neutral, Dark
- 14: The Last Remaining Purpose: Dark, Dark, Neutral, Dark, Hero, Hero
- 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
- 21: Disciple From The darkness: Dark, Dark, Neutral, Hero, Dark, Dark
- 22: Beloved Clone: Dark, Dark, Neutral, Hero, Dark, Hero
- 24: The Ultimate Replica: Dark, Dark, Neutral, Hero, Neutral, Hero
- 25: Sanction's Demise: Dark, Dark, Neutral, Hero, Hero, Dark
- 27: The Cleansing Of Darkness: Dark, Dark, Hero, Dark, Dark, Dark
- 28: Birth Of A God: Dark, Dark, Hero, Dark, Dark, Hero
- 29: The Last Soldier's Grim Fate: Dark, Dark, Neutral, Hero, Dark, Dark
- 30: Isolation and Solitude: Dark, Dark, Hero, Dark, Neutral, Dark
- 31: Archimedes and The Tortoise: Dark, Dark, Hero, Dark, Neutral, Hero
- 32: Where Is My Happiness?: Dark, Dark, Hero, Dark, then all hero
- 33: Seduced by Taste Of Blood: Dark, Dark, Hero, Dark, Hero, Dark
- 37: Last Will and Testament: Dark, Dark, Hero, Neutral, Neutral, Dark
- 38: Enveloped In Solitude: Dark, Dark, Hero, Neutral, Neutral, Hero
- 39: Parricidal Savior: Dark, Dark, Hero, Neutral, Hero, Dark
- 43: The Ultimate Confrontation: Dark, Dark, Hero, Hero, Hero, Dark
- 44: Miracle Of Love: Dark, Neutral, Hero, Hero, Hero, Hero
- 45: The World's Demise: Dark, Hero, Dark, Dark, Dark, Dark ending
- 48: Vainglory or Abandonment?: Dark, Hero, Dark, Dark, Neutral, Hero ending
- 50: Standing At The Summit: Dark, Hero, Dark, Neutral, Dark, Hero
- 51: Controller From The Capsule: dark, hero, dark, neutral, neutral, dark
- 52: Beyond One's Own Power...: Dark, Hero, Dark, Neutral, Neutral, Good
- 55: A Toast To The Ruler: Dark, Hero, Dark, Hero, Dark, Dark
- 56: Answer From The Black Comet: Dark, Hero, Dark, Hero, Dark, Hero
- 57: Transcendentalism: Dark, Hero, Dark, Hero, Neutral, Dark
- 59: The Weight Of One's Crimes: Dark, Hero, Dark, Hero, Hero, Dark
- 66: Birth Of The Robot Emperor: Dark, Hero, Neutral, Dark, Hero, Hero
- 68: A Solitary Android: Dark, Hero, Neutral, Neutral, Dark, Hero
- 69: Over The Original: Dark, Hero, Neutral, Neutral, Neutral, Dark
- 70: Machine Sunshine: Dark, Hero, Neutral, Neutral, Neutral, Hero
- 77: The Legend Of Shadow: Dark, Hero, Neutral, Hero, Hero, Dark
- 78: Power Of Love: Dark, Hero, Neutral, Hero, Hero, Hero
- 80: Walk My Way: Dark, Hero, Hero, Dark, Dark, Hero ending
- 82: A Monarch's Style: Dark, Hero, Hero, Dark, Neutral, Hero
- 84: To Be Ignorant Of The Past: Dark, Hero, Hero, Dark, Hero, Hero
- 91: The Rise and Fall Of The ARK: Dark, Hero, Hero, Hero, Dark, Dark
- 92: Requiem for a Fallen Angel: Dark, Hero, Hero, Hero, Dark, Hero
- 93: Ultimate Shadow: Dark, Hero, Hero, Hero, Hero, Dark
- 94: For Love's Sake: Dark, Hero, Hero, Hero, Hero, Hero
- 95: A Heart Awoken From Darkness: Neutral, Dark, Dark, Dark, Dark, Dark
- 96: Destruction From Perfection: Neutral, Dark, Dark, Dark, Dark, Hero
- 97: Darkness' Strongest Soldier: Neutral, Dark, Dark, Dark, Hero, Dark
- 98: Severed Chains: Neutral, Dark, Dark, Dark, Hero, Hero
- 100: To Be Known as "Ultimate": Neutral, Dark, Dark, Neutral, Dark, Hero
- 101: Dark Warrior's Advent: Neutral, Dark, Dark, Hero, Neutral, Dark
- 102: Arriving At The Ego: Neutral, Dark, Dark, Hero, Neutral, Hero ending
- 103: Determination Of A Fake: Neutral, Dark, Dark, Hero, Hero, Dark
- 104: Path To The Machine's Empire: Neutral, Dark, Dark, Hero, Hero, Hero
- 105: Demise Wrought by Tragedy: Neutral, Dark, Neutral, Dark, Dark, Dark
- 106: Turning Sorrow Into Strength: Neutral, Dark, Neutral, Dark, Dark, Hero
- 108: Stupefaction's End: Normal, Dark, Normal, Dark, Hero, Hero
- 110: Surpassing All Else: Neutral, Dark, Neutral, Neutral, Dark, Hero Ending
- 111: Soldier Of Grief: Neutral, Dark, Neutral, Neutral, Neutral, Dark ending
- 112: Reclaimed Heart: Neutral, Dark, Neutral, Neutral, Neutral, Hero
- 113: Fighting Spirit Of Steel: Neutral, Hero, Neutral, Neutral, Dark, Dark
- 114: Machine Soldier Uprising: Neutral, Dark, Neutral, Neutral, Hero, Hero
- 117: The Immortal Android: Neutral, Dark, Neutral, Hero, Neutral, Dark
- 118: The New, Coldhearted Empire: Neutral, Dark, Neutral, Hero, 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
- 122: Subjugating Heaven and Earth: Neutral, Dark, Hero, Dark, Dark, Hero
- 123: Road Of The Dark Soldier: Neutral, Dark, Hero, Dark, Neutral, Dark
- 124: Dark Finale: Neutral, Dark, Hero, Dark, Neutral, Hero
- 125: Realization While On Board: Neutral, Dark, Hero, Dark, Hero, Dark ending
- 126: Birth Of A Champion: Normal, Dark, Hero, Dark, Hero, Hero
- 128: The Road To Self-Assurance: Normal, Dark, Hero, Normal, Dark, Hero
- 130: Surpassing His Creator: Neutral, Dark, Hero, Neutral, Neutral, Hero
- 131: ARK. Colony Of Pathos: Neutral, Dark, Hero, Neutral, Hero, Dark
- 135: A Vow For The Victims: Neutral, Dark, Hero, Hero, Neutral, Dark
- 137: The Destined Sonic Showdown: Neutral, Dark, Hero, Hero, Hero, Dark
- 138: The Black Hero's Rebirth: Neutral, Dark, Hero, Hero, Hero, Hero
- 142: A Future Taken From The Past: Neutral, Neutral, Dark, Dark, Hero, Hero
- 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
- 146: Faith Taken From Solitude: Neutral, Neutral, Dark, Neutral, Neutral, Neutral, Hero ending
- 148: To unite humanity: Neutral, Neutral, Dark, Dark, Hero, Hero
- 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
- 156: Dark Destroyer: Neutral, Neutral, Neutral, Dark, Dark, Hero
- 157: Diabolical Power: Neutral, Neutral, Neutral, Dark, Neutral, Dark ending
- 158: For Freedom: Neutral, Neutral, Neutral, Dark, Neutral, Hero
- 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
- 169: Along With The ARK: Neutral, Neutral, Neutral, Hero, Neutral, Dark
- 170: Requiem For The Heavens: Neutral, Neutral, Neutral, Hero, Neutral, Hero ending
- 171: Sonic Dethroned: Neutral, Neutral, Neutral, Hero, Hero, Dark
- 172: Justice Reborn In Space: Neutral, Neutral, Neutral, Hero, Hero, Hero
- 175: Farewell To The Past: Neutral, Neutral, Hero, Dark, Neutral, Dark ending
- 177: The Guardian With No Past: Neutral, Neutral, Hero, Dark, Hero, Dark ending
- 180: Machine World: Neutral, Neutral, Hero, Neutral, Dark, Hero
- 182: Compensation For A Miracle: Neutral, Neutral, Hero, Neutral, Neutral, Neutral, Hero final Boss
- 183: The Strongest Hedgehog: Neutral, Neutral, Hero, Neutral, Hero, Dark
- 185: Voyage Of Reminiscence: Neutral, Neutral, Hero, Hero, Dark, Dark
- 186: Wandering's End: Neutral, Neutral, Hero, Hero, Neutral, Hero
- 184: The Ultimate Punisher: 3 Neutral, Hero, Neutral, Hero, Hero
- 189: Messenger From The Darkness: Neutral, Hero, Dark, Dark, Dark, Dark
- 190: The New Ruler: Neutral, Hero, Dark, Dark, Dark, Hero
- 191: Dark Soldier: Neutral, Hero, Dark, Dark, Neutral, Dark
- 193: The Machine-Laden Kingdom: Neutral, Hero, Dark, Dark, Hero, Dark ending
- 195: Birth Of The Dark Soldier: Neutral, Hero, Dark, Neutral, Dark, Dark
- 201: A Hero's Resolution: Neutral, Hero, Dark, Hero, Dark, Dark
- 203: Perpetual Voyage: Neutral, Hero, Dark, Hero, Neutral, Dark
- 206: And The Dream Continues: Neutral, Hero, Dark, Hero, Hero, Hero ending
- 208: The Path I Believed In: Neutral, Hero, Neutral, Dark, Dark, Hero
- 210: Machine Kingdom At Dawn: Neutral, Hero, Neutral, Dark, Neutral, Hero
- 211: Sinful Protector: Neutral, Hero, Neutral, Dark, Hero, Dark
- 215: Wandering For Eternity: Neutral, Hero, Neutral, Neutral, Neutral, Dark ending
- 216: At Vagrancy's End: Neutral, Hero, Neutral, Neutral, Neutral, Hero ending
- 217: The Summit Of Power: Neutral, Hero, Neutral, Neutral, Hero, Dark ending
- 218: Under The Name Of Love: Neutral, Hero, Neutral, Neutral, Hero, Hero
- 219: Eternally Drifting: Neutral, Hero, Neutral, Hero, Neutral, Dark ending
- 220: The Importance Of Truth: Neutral, Hero, Neutral, Hero, Neutral, Hero ending
- 222: This World'd Guardian: Neutral, Hero, Neutral, Hero, Hero, Hero ending
- 224: The Order Of Steel: Neutral, Hero, Hero, Dark, Dark, Hero
- 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
- 233: Prelude To Ruination: Hero, Dark, Dark, Dark, Dark, Dark
- 236: To Just Be Myself: Hero, Dark, Dark, Dark, Hero, Hero
- 237: Punishment In Jet Black: Hero, Dark, Dark, Neutral, Dark, Dark
- 240: The Faint Light Of Tomorrow: Hero, Dark, Dark, Neutral, Neutral, Hero
- 241: Time Of Departure: Hero, Dark, Dark, Neutral, Hero, Dark
- 242: Rise Of The Machine Kingdom: Hero, Dark, Dark, Neutral, Hero, Hero
- 245: Setting Out In The Morning: Hero, Dark, Dark, Hero, Normal, Dark
- 248: Making Up For It In The End: Hero, Dark, Dark, Hero, Hero, Hero
- 252: Howl Of Solitude: Hero, Dark, Neutral, Dark, Neutral, Hero
- 254: Ardent Vow: Hero, Dark, Neutral, Dark, Hero, Hero
- 256: A Reason To Live: Hero, Dark, Neutral, Neutral, Dark, 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
- 271:The Eternally-Closed Door: Hero, Dark, Hero, Dark, Hero, Dark, Dark ending
- 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
- 278: Maria's Testament: Hero, Dark, Hero, Neutral, Hero, Hero
- 279: A Genius Scientist's Lineage: Hero, Dark, Hero, Hero, Dark, Dark
- 282: Beloved Memories: Hero, Dark, Hero, Hero, Hero, Hero
- 283: Birth Of A Devil: Hero, Hero, Dark, Dark, Dark, Dark
- 284: A Dark Myth's Beginnings: Hero, Hero, Dark, Dark, Dark-Hero ending
- 285: Black Thunder: Hero, Hero, Dark, Dark, Neutral-Dark ending
- 287: A Soul Sheltered By Iron: Hero, Hero, Dark, Dark, Hero-Dark ending
- 288: Steel Nation's Decree: Hero, Neutral, Dark, Dark, Hero, Hero
- 291: The Doctor's Lie: Hero, Hero, Dark, Neutral, Neutral, Dark
- 296: Fullmetal Prince: Hero, Hero, Dark, Hero, Dark-Hero ending
- 299: Charm Of The Chaos Emeralds: Hero, Hero, Dark, Hero, Hero, Dark
- 300: Promise Of A Far-Off Day: Hero, Hero, Dark, Hero, Hero, Hero
- 309: Funeral Procession In Space: Hero, Hero, Neutral, Neutral, Neutral, Dark
- 310: Lost To The Universe's Abyss: Hero, Hero, Neutral, Neutral, Neutral, Hero
- 311: Destiny for Two: Hero, Hero, Normal, Normal, Hero, Dark
- 312: The Sound Threads Of Fate: Hero, Hero, Normal, Normal, Hero, Hero
- 314: Ghost Of The ARK: Hero, Hero, Neutral, Hero, Dark, Hero
- 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
- 2: Prologue To World Conquest: Dark, Dark, Dark, Dark, Dark, Dark, Hero ending
Pause the game and hold X. When you release X, the game will resume. Note: If neither Hero nor Dark characters have been seen yet, hold Start instead of X.
Use controller two to play as the Hero characters, such as Sonic, Tails, Knuckles, etc. This also works with Maria, but does not work with Doom's Eye. Note: They cannot pick up guns.
In most 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. You can also use the D-Pad to change your partner. Press Right for the Hero character, Left for the Dark character, and Down for the Neutral character.
Unlock and play the Last Story. You will begin a level called The Last Way after some intermission sequences. Once you complete this and reach Black Doom, there will be an intermission sequence, at the end of which Shadow will take the Chaos Emeralds and turn into Hyper Shadow.
Go to the stage were you have to kill the Chaos. There is a room near two GUN soldiers and a Chaos that has two weapon boxes in it. Break both boxes, then go in the room with the GUN soldiers. Go back and the boxes will be there again. You can repeat this as many times as desired.
In Expert mode, you must go through all of the levels one at a time without a break or mission, and on a harder difficulty. You are given five lives, any lives you pick up, but cannot continue. If you lose all your lives, you must start all the way back on the first level. However, if you find yourself in a dangerous position (for example, falling off a cliff), press Start before the game registers the loss of the life, then select "Quit". At the Expert mode menu, select "Resume". You will start at the beginning of the level you were on, but you will not lose that life and will resume with the total lives you had previously.
Do not bother using the homing attack, as it is too hard to get to, and it is difficult to keep hitting him like that. Instead, defeat the two Black Arms soldiers and collect the guns from them. Then, go to the spring and use it. Move forward a bit so you do not start grinding the rails. Pass Black Bull in your jump, and rapidly shoot a little before you level with its eye. Repeat the strategy, and if you fill your Hero gauge, activate Chaos Control and finish him off. This is more effective and easier than to grind around him and shooting him every time around, which wastes ammunition on a lot of missed shots.
At the start of the fight, run up to him and start using homing attacks on the Black Volts to get to his eye. When you hit him once, wait until Shadow comes out of spinning from the recoil and straightens up, then attack again. This will minimize your chances of diving to him and getting hurt instead of another homing attack. Continue this as long as possible. When he is in the middle of the street, there will be no Black Volts to bounce on. Instead, run directly under his head, then run away before he creates a shockwave under himself. By doing this, Black Bull will tilt his head down, making it an easy target. When he moves back, repeat. If you get a Gun from Black Arms soldiers, use it, but do not waste it. You will most likely fill your Hero gauge by then. Use it when he is easy to hit, then finish him off. He should not be too hard to defeat.
At the start of the fight, run in the opposite direction that you face. Keep running until you find three monsters with pistols; one of them has a shield. Kill them all and take the pistols, but do not use the pistols yet. Then, attack the little birds and press X repeatedly until the Boss moves out of range. Keep doing this until your Hero Gauge fills. Use Chaos Control and shoot Black Bull.
Play as Hyper Shadow and hit him with the Chaos Spear(s). First, try to avoid the meteors that shoot lasers at you, or destroy them if desired. Charge your Chaos Spear with Square and shoot Devil Doom in the eye. Devil Doom's third eye will go to the other head. Go to the other side and charge your Chaos Spear. Shoot him in the eye again. Note: Make sure to shoot the balloons to get rings if you are running low. When you shoot him in the eye, immediately go to the other side, and charge your blast . When Devil Doom's third eye gets to the other side of the head, shoot him. Go to the other side and shoot him, then go to the other side and shoot him and repeat.
Finish The Ark level with the Dark objective. Then an intermission sequence will appear where the Black Arms fire the Eclipse Cannon and hit Central City, starting at the capital, which bears a striking resemblance to the famous Independence Day movie scene where the White house was destroyed.
At the start of Lethal Highway level, you should see a billboard to the right with an advertisement for a drink or something similar. If you continue watching it, it will switch to a picture of NiGHTS, which will then change to the NiGHTS title.
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.