Sonic the Hedgehog 3 Strategy Guide (Brady Games, Unknown Date)
From Sonic Retro
The Sonic the Hedgehog 3 Strategy Guide by Brady Games gives a complete walk-through of Sonic the Hedgehog 3. Page 82 contains an interesting bit, as it refers to a final battle with Metal Sonic in Sonic the Hedgehog CD, even though normally he is never fought, but instead it is a head to head race which ends when Metal Sonic crashes into a wall.