I doubt it was incomplete seeing as a few people around the web have posted cheats for the game and also because IGN always say if a game was cancelled. However, maybe it was like one of those games where they only made about 100 copies or something....
Speaking of IGN I apologise, the link in my last post seemed to link to a completely different page.
But I'm sure if you go to IGN and then search for Sonic Quest you'll find the page.
*Sighs* I always wonder what the introduction was like in this game....
Warning: This is a reconstruction
(Sonic stands around in some random 8-bit castle, Robotnik then flies in on his robot from Sonic Labyrinth with the Boss music from the Game Gear version of Sonic 2 playing in the background)
Robotnik: Ha! Ha! Ha! I will steal your sneakers this time, little hedgehog!
(A claw, similar to the one Robotnik uses to pick up Knuckles in Sky Sanctuary Zone in Sonic & Knuckles, comes out of his robot and steals Sonic’s sneakers)
Sonic: Hey! Give them back Ro-BUTT-nik!
Robotnik: Why should I? I’m a cruel-spirited egghead, not Santa Claus!
Sonic: Ok, enough with the lame jokes, you’re annoying everyone!
Robotnik: Shut up, you’re getting on my nerves! Besides, I only wanted your sneakers to learn more about Athelete’s Foot!
Sonic: I have a book on that!
Robotnik: No way! It has Hedgehog cooties on it (Pictures little blue micro-organisms singing the Sega song in squeaky voices in his head, then shudders)
Robotnik: Anyway, I’m going to bog off now, I have World domination to think about....
(Robotnik flies off and then a Blacksmith walks over to Sonic)
Blacksmith: Sonic, take this sword and find Robotnik!
Sonic: Oh, well.... It’s better than Sonic Labyrinth 1....
(He walks off and goes into a casino)
Person in the Casino: I will sell you a crystal....
Sonic: Erm.... CRYSTALS?
This is Sonic the Hedgehog not Crash Bandicoot!
Person in the Casino: Oh, just buy the darn thing! I’m broke after becoming a member of the Sonic Labyrinth Design Team!
Sonic: I pity you....
(Buys crystal)
(Sonic goes outside and some badniks appear with swords, Sonic fights them in a Zelda-esque style then picks up a key one of them dropped and goes through a door behind the badniks)
(Robotnik appears)
Sonic: Give back my sneakers! They smell of fish anyway!
Robotnik: NEVER!!!! Ahahahahahaha!!!!
(Boss fight begins)
End of pointless reconstruction