As for the Sega end of gaming, here is the final part of Sonic X-Treme
Level 10: Launch Base Caverns
After knocking the Chaotix offline, Knuckles explain the situation. The Chaotix are a group of anthros who came to the island when the Death Egg crash landed hoping to explore. Knuckles didn't meet them until Sonic and Tails left, but they've been helpful in clearing out the island of Robotnitk's madness. All that's left of Robotnitk's power base here is a badnik manufacturing plant built underneath the Launch Base Zone. The mission went south due to an ambush placed by the Eggrobo. Knuckles only escaped because he dug out back to the surface. His words. Wanting to bring down this plant, Sonic agrees to take down this plant. By the end of act 3, the same trap is sprung.
This trap extracts the Rings of Order from Sonic, Tails, and Tiara as it was set up by another Metal Sonic, who turns the rings over to a face all hope to never see again:
Robotnitk: OHHOHOHOHOHO Well now once again we meet, Rodent. But this time you're in a much agreeable position. Once your all out of the way, the rest of your world will fall like paper in the wind. But enough gloating, time for your imminent demise!!!! *warps away*
The entire room begins blinking red as a voice announces that the self destruct sequence has initiated. Two Minutes to activation. As panic sets in, Tiara begins chanting a mantra. With only 15 seconds left to spare, Sonic and co are teleported out of the base.
Level 11: Solaris Sanctum Zone
Back with Robotnitk, he promptly loads the energy of the rings into 3 empty tanks. Next to them are 3 full tanks with the color red, blue, green, while the new tanks are yellow, orange, and purple. Robotnitk smiles when the energy readings jump up to 100%.
Robotnitk:”Perfect, with these energy readings, I have the power to use my greatest invention ever, THE DIMENSIONAL BATTERY!!!! A whole new world for me to invade, enslave, and exploit for my own benefit WOOHOOOHOOO”
Fang: “Well your conquest plan is all well and good, but you and I have business to take care of, namely the rest of my payment.”
Robotnitk: “Tell me weasel, do you take cash or CHARGE!!!
Another freeze trap is activated over Fang as he begins to respond. He tries to bang on the glass but it promptly shocks him.
Robotnitk: “Oh I have a much better payment for you, you get to serve me as a headhunter badnik.”
Fang can only look in horror as his hand begins to become more metal and a droning mantra drills in his head: OBEY OBEY OBEY OBEY OBEY OBEY!
Back with our heroes...
They end up teleported back into a temple. One that seems very similar to the Westside Island Hidden Palace. This is Solaris Keep, home of the ringsmithers. Tiara explain that eons ago, the ringsmithers opened a portal to their world from their own dimension. Why? Because the ringsmithers were dedicated to stopping the spread of chaos. The Rings of Order were created to keep things balanced but because the source of those rings power was back in her own dimension. They can reach the grand ring from here to hopefully open another portal to wherever Robotnitk has stored the rings energy. What follows is a one act level that plays very similar to Adventure's lost world. Once they reached the sanctum, there lies another lynx: Tiara's ancestor and the elder guardian. To reach the ring, they must defeat him. But upon doing so, Tiara feels the presence of rings coming near her, Tails asks where but he gets his answer: a massive drill bursts into the sanctum and announcement is made:
Robotnitk: “Greetings inhabitants of this dimension, I am Doctor Robotnitk, scientist extraordinaire and your new master! I have come here to give you all the benevolence of my iron fisted rule. Resist and your lives are forfeit.”
Final Level: The Dimensional Battery
The final level is a doozie: a open arena gauntlet battle with Knuckles against a horde of every badnik in the game. Tiara takes on a now robotocized Elder Guardian, another race with Sonic and Tails against Metal Sonic and Headhunter Fang, and finally, a throwdown with Robotnitk's Ring Knight, A armored suit powered by the rings of order. In order to defeat this monstrosity, Sonic and co must break the energy wires connecting the mech to the ring tanks. Once all six are taken down, it'll take another four hits to destroy the Ring Knight and reclaim the rings of order. They quickly return the rings to the inner sanctum while the Dimensional Battery falls back into the rift it opened. Once there, the energy is transported back into the grand ring and it quickly brings life to the entire dimension they're in. One we get to see thanks to Dreamworks making a cutscene for the game. Sonic, Tails, and Knuckles return to their home while Tiara sets out to perform damage control. But after the credits, we cut back to Angel Island, where the Master Emerald begins to crack.