1. Game starts with the festival (like in the trailer)
2. Eggman trys to take the blue emerald fome Elise, but she doesn't give it to him.
3. Sonic comes rescue her and destroys most of the robots and runs away... (in the trailer)
4. Silver says, I finally found it the Iblis trigger.... (same voice clip, but diffrent scene.)
5. Elise gets captured by Eggman, right after sonic saved her and Eggman says "For now Sonic, I'll let you keep the chaos emerald, I'll just get it later.." (something like that, I don't remember) Eggman then leaves in the NEW Egg Carrier. Yes, its the Egg Carrier.
6. After that scene, your sent to a town stage (Soleanna), where you meet Tails and Sonic says once again, "Yo Tails, long time no see!"
7. After meeting up, your supposed to find some old guy to test out his new sneakers by doing a minigame by jumping through hoops. After you complete this town mission, he gives you his sneakers and you earn money when the mission is over to buy the "light dash chip" to advance to the first level by light dashing to a cave.
8. First Level, "Wave Ocean" not Kingdom Valley. This level includes, regular gameplay, a small segment to play as Tails when sonic is stuck on the whale, and the first Mach speed area. (It was hard the first time, its also kinda like Secret of the rings, but without the Wii remote.)
(I really don't remember much after this point but I will try...)
9. You return to a Town Stage then you either play that Dessert level (which you carry elise) or fight that Mechanical Wolf Boss (this boss is super easy) I don't rember the order...
10. After the dessert level, A cut scene with SOnic and Elise talking, happens..
11. This is it, the 2nd Boss, Silver. Silver says, "Your the Iblis Trigger! You will codemn us all!" (Silver will deffinettly remind you of Future Trunks from DBZ due to similar situations and voice.) This boss was hard at first, Silver will definetly own you the first time you play him. To defeat him, do not face him head on, wait for him to throw objects at you and homing attack him quickly, then run again.... repeat this plan. Silver cheats when he throws you in the air, when you fall back down from being thrown, before you touch the ground he grabs you again for the 2-hit automatic kill. After you eventually beat this boss, Sonic checks on Silver who is on the ground and asks, "Are you ok?" Silver then sneaks attack Sonic and throws him into the building and says "Hmm, your not what I expected, no matter you are the trigger so I must defeat you" (again, not exactly what he said, because I don't remember) Amy comes from somewhere and protects sonic in the same stance as she protected Gamma, and says "stay away from Sonic, Silver". Silver replied, this doesn't concern you Amy, get outta the way! Amy says, Get outta here Sonic, I'll take care of him." Sonic leaves and thanks Amy.
12. After the Silver boss, Sonic has to play another town mission by finding the true general in order to get pass the gate. When you play the minigame, go straight to the general (who is the guy in front of the water fountain) and tell him yes, He will ask you to talk to the true general now. Now, speak to him again. He was the true general after all, and says he wanted to trick you and blah blah.
13. Tails calls you, and says to me up with Knuckles at the warehouse. Remember the gate you just opened? Go pass the gate to the next town area and look for the warehouse. When your at the warehouse, jump over the gate to play another town mission by destroying all the robots within a time limit. After this mission is over, you meet up with Knuckles who gives Sonic a holographic message fom Dr. Eggman. "If you want Elise, come bring me your Chaos Emerald Sonic." Tails replies Eggman will probably not keep his word. Sonic then says, No Matter what, I'm still going. (this part was kinda funny because when sonic threw the letter back to Knux, Knux missed the letter and couldn't catch it....)
14. There is a laser gate i the new town area, go to it then play another, beat the robots within the time limit minigame. Onvce this minihgame is over, you advance to the next level.
15. The next Level is the Snow level that resembles Ice Cap from sonic adventure. On this level you play on thesnowboard and dodge robots and snowballs. (I never got to finish this level aand that was the last Thing I played on Next-Gen, for Sonic's story anyways..)