OK you have defeated Dok-Ock. Now the Green Goblin boss is as easy as the first, which is pretty simple.

The G.G will fire a range of missiles and razor-bats. Then he will toss 4 pumpkin bombs at you.

You need to pull them towards you and toss them at him.

If he is moving they are useless against him.

When he stops flying hit him and he will lose some health.

CAUTION: Pumpkin bombs will explode after a while so hit him quickly.

If you are fast enough you will be able to hit him twice in one round.

Repeat this process until he is defeated. CONGRATULATIONS now you can fight with the G.G.