Jak 3

Story related and cannot be missed.
You will start off in the Sand Shark and will be directed to destroy 14 nodes. They can be found on the legs of the walker as he moves. Drive around and destroy all 14. I found that having the secret upgrade that gives vehicles extra armour was extremely helpful. Once you have destroyed all 14, you will find yourself on the beast itself. Head up to the open area up top. Once you get there, the boss will appear.
1. Enemies and tentacles will appear. Destroy the tentacles, the enemies will respawn regardless.
2. Once you have destroyed the tentacles, the boss will fire a laser which will follow you around – just keep moving and you won’t be damaged.
3. The boss will then sweep its head, and the beam, across the platform. At this point it can be damaged, so shoot it with any weapon, and it will take a large chunk of health.
4. The boss will then smash the ground with its head. This is very damaging, attempt to avoid it.
5. Repeat these steps 4 times and you win the fight!
Tip: if you are having trouble defeating this boss, keep in mind that while the boss is vulnerable, a Light Eco vent appears on the right side of the area which you can use to heal yourself.