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In the console/PC version, the stage where Metal Sonic can be battled is located above the Chemical Plant area of White Space after Sky Sanctuary has been cleared.
The battle takes place on an infinite stretch of road in the bad future of Stardust Speedway, with Metal Sonic flying overhead, attacking Sonic. It begins with a cutscene, in which Classic Sonic is shown running through Stardust Speedway until Classic Metal Sonic destroys the road. Sonic then uses the falling debris to get back up, along with jumping on top of Classic Metal, who then recovers from the blow and attempts to hit Sonic, but misses. After that, the two begin to battle.
During the battle, the player will be constantly running to the right, though they can control their speed by pressing the left or right buttons. Metal has a variety of attacks, including the Ring Spark Field, flying into the foreground to snap off street lights to fall on the player, and the V. Maximum Overdrive Attack. After attacking, Metal Sonic becomes vulnerable for a short amount of time, allowing the player to counterattack with a Spin Jump.
Metal Sonic starts the fight by lunging forward at Sonic, forcing the player to jump out of the way. After being attacked, Metal will perform a Ring Spark Field attack where he generates a huge amount of electricity around and directly underneath him that Sonic must avoid or attack while he's charging it. Metal's next attack involves snapping off street lights to throw directly at Sonic; the player must avoid these by watching the shadows of the streetlights on the road. Finally, Metal will attack with a powered up version of his first attack, which can avoided by jumping up on higher platforms. It takes a total of four hits to defeat Metal Sonic on Normal and Hard mode. Once Metal is given the final blow, there is a brief cutscene of Sonic roundhouse kicking Metal Sonic away, who proceeds to explode.
Hard Mode[]
In Hard Mode, Classic Metal Sonic is much faster, making it harder to avoid his attacks. The order of his attacks also changes; he snaps a total of five street lights at Classic Sonic before performing his Electric Shield attack, as opposed to two in Normal Mode.
Nintendo 3DS[]
In the Nintendo 3DSversion of Sonic Generations, Metal Sonic will either resort to use the Ring Spark Field or his V. Maximum Overdrive Attack, depending on the player's position to Metal Sonic. If the player is before him, he will use the former, but if the player is ahead of him, he will use the later to slowly outpace Sonic.
During the race, Metal Sonic does not seek every shortcut along the racing course in case the player is not ahead of him or has used them. The player can also attack him with a Spin Attack to slow him down.
"I WILL BATTLE YOU AS MANY TIMES AS IT IS NECESSARY."
—Metal Sonic's rematch quote
Trivia[]
The background music used during the battle against Metal Sonic is a remix of "Stardust Speedway "B" mix" from the Japanese soundtrack of Sonic the Hedgehog CD.
The console/PC version and the remake of the game also allows an optional remix of "Stardust Speedway - Bad Future", from the American soundtrack of Sonic the Hedgehog CD, to be played instead.
Metal Sonic is the only rival boss that is not an ally of Sonic.
Metal Sonic is the only rival that Classic Sonic fights.
The aspect of Stardust Speedway in the console/PC version of the game would later be reused for the opening cutscene of Sonic the Hedgehog 4: Episode Metal released the following year.
Some of the skyscrapers in the background look similar to the Ionian column design used in Greek architecture. This could be a reference to how Stardust Speedway's past is heavily based on ancient Greece.
This is the only Classic Sonic boss fight to have an auto running feature, as if the player does not move the control stick that moves Sonic, he will continue to move at a slow pace that barely keeps him from falling with the disintegrating road.
While facing Metal Sonic, there is a glitch possible when he uses his final attack. Getting hit at a certain point on the screen will cause nearly all of the platforms on the stage to vanish. Sonic will turn around and continue running, with the camera fixed so that he does not always run in the same direction. Despite the glitch, Metal Sonic will continue to attack, and can in fact be beaten. The floor will remain invisible during the cutscene and result screen. The glitch can be removed by pausing and starting over.
In the console/PC version of the battle, Metal Sonic's jet engine emits purple energy streams behind him. However, in the Nintendo 3DS version, the energy streams are blue colored.
It is possible to hit Metal Sonic with Classic Sonic's Homing Attack in the Nintendo 3DS version, to do so it is required to aim the Spring that sends you backwards with the right timing. Just like Shadow this is impossible to do so without the right circumstances.
