Sonic Adventure/Sonic/Ice Cap

Sonic and Tails have just found a Chaos Emerald in Icecap and wander around in Mystic Ruins. As they arrive near the lake area, they meet Knuckles. Sonic greets Knuckles but Knuckles just gives him crap. He tries to attack Sonic with his punches but, of course, he misses. Knuckles wants the Emerald Sonic has because he thinks it's a piece of the Master Emerald (Robotnik tricked him; he is on a search for all the Master Emerald pieces to restore it). Sonic refuses to give it up and they get into a fight.

Knuckles
Knuckles is also nothing to worry about; he's easier than the previous enemy. His attacks are very simple. You can hurt him just by turning into a ball.
 * Difficulty: Very Easy
 * Damage: 3 hits
 * Importance: Moderate

Knuckles simply just punches. Just hurt him easily with any kind of attack. Knuckles will then follow you and turn into a ball, which is a very useless attack. Just hit him. Then Knuckles glides around, which is also very useless. When he gets down, just hit him. After beating him, nothing happens.

After the Knuckles fight, the cutscene continues on to show that Sonic and Knuckles take a charging blow at each other and they finally knock each other down, causing Sonic to drop the two Chaos Emeralds he has. This was all a plan of Dr. Robotnik, who was secretly watching them the whole time and now appears to them to steal the Emeralds again. Robotnik reveals his plan to them and Sonic shuns Knuckles. Now Robotnik summons Chaos and gives him two more Chaos Emerald (he already has two Emeralds from before due to Sonic and Tails' carelessness) to absorb their power and transform to an even more powerful monster. This is going to be overwhelming.

Chaos 4

 * Difficulty: Medium
 * Damage: 5 Hits
 * Importance: Major

Finally comes a fight with a bit more challenge. Something to remember here is to stay on the lily pads. You can touch the water, but don't stay on it to long or you will sink and get hurt. His attacks can be tricky but they aren't hard to dodge. If you get very close to him, he does a special attack where he will stretch his arms out to get you. This feels like a long fight because you have to wait until he gets out of the water to hit him.