Question: To unlock Knuckles in Sonic Adventure.
Options:
Reach the part where you fight E-102 (as Sonic or Tails), fight him and Chaos 6.
Reach the part where you fight Knuckles (as Sonic or Tails), fight him and Chaos 4.
Answer: Reach the part where you fight Knuckles (as Sonic or Tails), fight him and Chaos 4.