The very last level of Sonic Adventure 2/Battle. Right after it you fight the Biolizard/FinalHazard.
I thought this stage was very unique in the fact you can play as all the characters (with the exception of Shadow) and have different kinds of gameplay all at once. However, it was so goddamn hard when it came to Rogue and Knuckles. I remember the diving mission where Rogue had to go through the water pipe and you had to hit the switches before the pipe turned back on and swept you away. ANNOYING!!!! Not only do you have limited air, but there were so many goddamn obstacles in the way lol.
After that, though, Sonic's part was wicked easy.
I thought this stage was very unique in the fact you can play as all the characters (with the exception of Shadow) and have different kinds of gameplay all at once. However, it was so goddamn hard when it came to Rogue and Knuckles. I remember the diving mission where Rogue had to go through the water pipe and you had to hit the switches before the pipe turned back on and swept you away. ANNOYING!!!! Not only do you have limited air, but there were so many goddamn obstacles in the way lol.
After that, though, Sonic's part was wicked easy.