I'm not going to do this often, but just to hype it a bit I'm going to give you a direct sample of what I'm writing. Behold, the first level. Includes five characters. When I actually start posting complete worlds, should I do so here, on my blog, or both?
Chapter 1: The awakening of the dark count
Level 1: Angel Island
Play as: Metal Knuckles
The opening cutscene for the miserable little pile of secrets of an adventure mode shows Knuckles snoozing against the master emerald, neglecting his guard duties. The chaos emeralds are on pedestals around the master emerald, the place being an insane source of power. The camera pans to the opposite end of the bridge to angel island, where Metal Knuckles and Shadow the Hedgehog can be seen coming up to it from seperate sides. They both go to go onto the bridge, but then realize they're both after the same thing. Shadow smacks Metal Knuckles off the bridge, but Metal Knuckles uses his built in jets to come back out from the abyss and a fight follows, you playing as Metal Knuckles. The battle takes place just outside Angel Island, it being in the background for the battle of the two Sonic anti heroes.
After Metal Knuckles defeats Shadow, he lets out a robotic evil laugh then proceeds over the bridge. He clenches his fists as he sees Knuckles, glaring directly at him with hate. He zooms up towards him. . .Just to see that he's asleep. The robotic version of Knuckles goes up to Knuckles and pokes him in disbelief, the real Knuckles sleeping through it. Metal Knuckles lets out a robotic laugh at this, which of course wakes up the real Knuckles. Metal Knuckles has a dumbfounded exspression at his dumb luck, while Knuckles gets up angrily in a fighting position. You play as the normal Knuckles against the robotic version in a battle to determine who the superior one of the two is.
After defeating his imposter, Knuckles chuckles and kicks him away, disregarding him as mere scrap metal. Knuckles kicks back and relaxes again, thinking the rare instance where he actually has to defend the master emerald is over, but Shadow zooms up, spin dashing to run over Knuckles. Metal Knuckles seemingly did a poor job of finishing Shadow off, as he gets into a fighting stance and motions Knuckles to come to him, then folds his arms. Knuckles gets up angrily, annoyed at yet another intruder, cracking his knuckles. A battle starts, and this time you play as Shadow.
After the battle, Shadow dismisses the two "Knuckleheads" with a motion of his hand, displeased with how "pathetic" they were. He goes over to the chaos emeralds, grinning with an evil smile, but suddenly a portal opens, Shadow curiously turning his attention to it. Doopliss and the Grim Reaper come out of the portal, Shadow raising his eyebrow. Doopliss motions to the Grim Reaper then to Shadow, telling him to dispose of him, while the Grim Reaper isn't in a mood for the combat, instead retorting back to Doopliss that he must be the one to defeat Shadow. Shadow impatiently taps his foot with his arms folded while waiting, and you get to choose the Grim Reaper or Doopliss to fight him with.
After the fourth battle, Shadow weakly falls to the ground, collapsed, and the two undead beings chuckle evily. The Grim Reaper motions to one of the chaos emeralds with his scythe, and his four reaplings go to retrieve it for him. They go back into their portal which closes behind them after another brief session of laughing, Shadow watching as they do so weakly. Shadow manages to pull himself over to one of the chaos emeralds and then uses chaos control to go to the place the two undead beings did, unintentionally taking Knuckles and Metal Knuckles along with him.