Sly 3: Honor Among Thieves

Mission related, cannot be missed. Acquired in Episode Five.

Be mindful that the monster doesn't have a health bar. This monster doesn't like visitors. The mission is Crusher from the Depths.

You start off as Panda King on the boat. Use the rockets to shoot down the tentacles, after a while the head of the monster will appear, shoot at it (there will be a green cross hair, which will turn red when it's locked on).

He will shoot fiery boulders at you so watch out. Just keep hitting him until he falls. Then you will have to shoot the tentacles that are trying to tip the boat over. Take out as many as you can until the next phase starts.

After the monster's head resurfaces, he/she will bring tentacles with it. Aim at them while aiming at the head. 5-6 times in the mouth will take it out. Once that is over Sly will come out and take over(man that monster is big).

Sly's turn
Use the cannons to damage the monster. First you will have to whack the tentacles that stick to the boat. Hitting it will make the monster come closer after you have 3 of the tentacles on the boat. Then the cannon will be effective on the monster.

The next time around you will have to stick 4 of the tentacles to the boat, while watching out for the fiery balls.

After that you have to whack 5 tentacles and dodge fast fiery boulders coming at you. There will be shadows, so don't get hit by the tentacles.

After the last hit, the gang will come to the top of the boat and Guru will try to make the Crusher a new member of the team. The Guru will leave.

Thanks lyokodude122 for the video: