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There were originally plans to have Knuckles' Chaotix and SegaSonic the Hedgehog included in the game. The only remnants of Knuckles' Chaotix is in the game's art gallery, and SegaSonic the Hedgehog was cut due to problems with emulating the game's original trackball control scheme.
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In the Museum of Sonic Gems Collection, a number of classic Sonic games can be unlocked. These games start at the final boss, and can only be played for a set amount of time.
By using a cheat device to freeze the clock it's actually possible to play the entire game after the final boss is defeated.
By using a cheat device to freeze the clock it's actually possible to play the entire game after the final boss is defeated.
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There are several games that are not present in the US version, but their listings in the games menu can be seen with Action Replay codes. These games include:
• Bonanza Bros
• Streets of Rage 1
• Streets of Rage 2
• Streets of Rage 3
• Wonder Boy III: Monster Lair
• Wonder Boy in Monster World
• Monster World IV
• Sonic Eraser
Bonanza Bros and each Streets of Rage game are unlockable in the Japanese version but none of these games can actually be played on the US version.
• Bonanza Bros
• Streets of Rage 1
• Streets of Rage 2
• Streets of Rage 3
• Wonder Boy III: Monster Lair
• Wonder Boy in Monster World
• Monster World IV
• Sonic Eraser
Bonanza Bros and each Streets of Rage game are unlockable in the Japanese version but none of these games can actually be played on the US version.
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Sonic Forces: Speed Battle
Sonic Riders
Sonic Rush Adventure
Sonic Rush
Sonic & All-Stars Racing Transformed
Knuckles Baseball
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Sonic Boom: Rise of Lyric
Tails' Skypatrol
LEGO Dimensions
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Sonic the Hedgehog 4: Episode I
Mario & Sonic at the Rio 2016 Olympic Games
Sonic Dash
Shadow the Hedgehog
Sonic & Sega All-Stars Racing
Sonic the Hedgehog 2
Sega Top Ten
Team Sonic Racing
Sonic Adventure DX: Director's Cut
Sonic at the Olympic Games
Sonic Mega Collection
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Sonic the Hedgehog Pocket Adventure
Sonic & All-Stars Racing Transformed
Sonic Lost World
Sega Superstars Tennis
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Sonic Colors
Sonic Riders: Zero Gravity
The Murder of Sonic the Hedgehog
Sonic Origins Plus
Sonic Pinball Party
Sonic Advance 3
Sonic Lost World
Amy & Rouge Tennis
Sonic the Hedgehog Chaos
Sonic and the Black Knight
Sonic the Hedgehog: Spinball
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Dr. Robotnik's Mean Bean Machine