Jak II: Renegade Cheats (PlayStation 2)

The leader of the metal heads is the last boss of the game. After you 
start fighting him, there is no way to go back to the city until you 
defeat him, which means you can't collect ammo other than the blaster 
ammo around the nest, so be sure to come with full ammo of all gun 
barrels. It is also a smart thing to have all the dark Jak abilities, 
including giant dark Jak. There are three parts to the boss:

1) When the battle starts, the boss lays metal head eggs that dont hatch 
for a few seconds. Use this time to shoot the metal head leader with a 
few blasts from the peacemaker or whatever you have ammo for. When the 
eggs start to hatch, dispose of the small metal heads quickly with your 
blastr or scatter gun, and avoid the leaders single shots of 
concentrated dark eco.while shooting and running from the smaller metal 
heads, keep turning towards the center of the nest to land some shots on 
the suspended boss. When you have depleted 1/3 of its health, it will 
momentarily lose some supports and limp. get ready for part two.

2)Part two is identical to part one except you don't get any time at the 
beginning and flying metal heads will come up from the hole in the 
center of the nest. Also, the metal head leader will give a double shot 
of concentrated dark eco, so be sure to jump or roll away twice when 
evading its shots. Once you diminish the 2nd third of the boss's health, 
it will jump down from its suspensions and part 3 will begin.

3)The metal head leader chases you around the nest, pounds the ground 
causing a circle of dark eco to come from it which you must jump over 
(like shockwaves from other games), and will shoot a triple shot of dark 
eco. If you do not have enough dark eco to turn into dark Jak, just keep 
shooting the boss and keep evading his attacks. Otherwise, mutate into 
dark Jak, transform into giant dark Jak, and administer a dark bomb. 
This will deplete more than half of the monster's remaining health, and 
is a good head start on finishing him off. After that keep evading and 
shooting until the beast collapses. 

This may take a few times, so if you get low on blaster ammo or need to 
collect more dark eco for dark Jak, waste a couple lives collecting ammo 
and shooting all the small metal heads to collect dark eco. After you 
defeat the boss, sit back and enjoy the ending movie.

To Get the peacemaker gun you have to escort three of Krew's worker guys 
down to this statue in the sewers.This gun can blow up absoulutly 
anything in one go. If you find loads of guards together shoot into them 
and they conduct the electricity  the gun fires or something because 
they all fry. this gun is the same as Sig's gun(krews wastelander)

Go to the micanic (and it's the 3rd or 4th mission after you beat the 
jet-board compition) she'll tell you to go to Haven forest and when you 
get in it, the room between the cty and the place you are going(it takes 
forever to unlock), the micanic will give you the jet-board.HINT: you 
have to use the jet-board for A LOT of missions.

Late in the game after when you do the mission to destroy all hellcat 
cruisers you will be told to go to Onin and Pecker and also the old 
geezer is there not Samos, um whats his name um Kor but that does't 
matter you will have to complete a task set by Onin first. Triangle , 0, 
[] and x will appear on the screen at different times out of the pot get 
to 400 points and you will be able to get to mar's tomb just follow the 
map put all three artifacts in the right places then you will see a clip 
where everything blows up in haven city. Go back out go to the thingy on 
the map see a clip where the Oracle speaks and says something and at the 
end everyone apart from Jak and Daxter gets arrested and you will be put 
to the test...

Dark Power: Dark Bomb

At a cheap price of 25 Skull Gems, you can unlock this paralysing move. 
Great for taking out all enimies if their surrounding it(X+[])

Dark Power: Dark Dash

This cool move is 200 skull gems and will inflict pain upon anyone who 
messes with you([]+X)

Dark Power: Invincibility

This granted power allows Dark Jak to be Invincible!! You shall not lose 
a single life point whilst in Dark Jak with this

Dark Power: Dark Giant

The last of the moves given to you by the oracle is Dark Giant. By 
pressing L2 when in Dark Jak mode you will turn into the Dark Giant Jak. 
Double the size, double the speed double the attack power. I wonder if 
anything else doubles?!!!

When You get to the Tomb of Mar(Or something like that) you have to beat 
the two Tests of Manhood.It takes about an hour to beat 'em, because 
there are a lot of puzzles and obstacles to overcome. Well, once you get 
to the end of the challenge, you finally get to the long awaited 
Precursor Stone. Who's to say that Praxis gets in your way! So I'll tell 
ya how to beat 'em.

First you see him jump onto the statue with his giant spider robot. He 
starts drilling at the stone, but, to keep you occupied, he launches 
these mini spider-bots. Don't try to punch 'em because they're 
electrified.

Take out two or three of 'em at once with the scatter gun.

Then Prax will launch time bombs all over.

Now's your chance to strike back. Get in front of one of the bombs and 
punch it in his direction. If a good shot,  it will hit him. Do this 
until all of the bombs are gone. He'll launch those spider things again, 
beat 'em, and repeat until his health is at yellow. If his health is at 
yellow, he'll occasionally jump off and and pop up somewhere and shoot 
at you. Hide behind the pillars when he shoots. Then he'll do the bomb 
bit again. When his health is red, he'll aquire the stone, and attach it 
to his robot. Needless to say you should hide when he blasts with it at 
you.

He'll do this and launch bombs and shoot all at the same time. You got 
to be quick and punch those bombs. Stay close to a pillar, but they 
collapse if he hits it to much. If you follow this, you should have him 
beat. But Prax is'nt going down this time either.

Morph Gun: Peacemaker

I found it!! You get it after escorting the 3 fools of men that are 
Krew's workers through the sewers.

 

Morph Gun Upgrade Number 1:

This upgrade handily increases your rate of fire for the Scatter Gun.

Morph Gun Upgrade Number 2:

This cool upgrade doubles the amount of ammo you can have in the Blaster 
and Scatter Gun

Morph Gun Upgrade Number 3:

This decent upgrade is given to you by Krew before the boss battle with 
him. It increases the damage caused from one shot.

Collect the following
  number of Orbs to unlock the cheat indicated in the Secrets Menu

  Toggle Jak's Goatee cheat: To get this you must collect 5 orbs during
  game play.
  
Mirror World cheat: To get this you must collect
  15 orbs during game play.
  
Big head mode cheat: To get this you must
  collect 30 orbs during game play.
  
Small Head Mode cheat: To get this you must
  collect 45 orbs during game play.
  
Scrap Book cheat: To get this you must collect
  55 orbs during game play.
  
Scene Player Act 1 cheat: To get this you must
  collect 65 orbs during game play.
  
Vulcan Fury Course cheat: To get this you must
  collect 75 orbs during game play.
  
Scene Player Act 2 cheat: To get this you must
  collect 95 orbs during game play.
  
Peace Maker Gun Course cheat: To get this you
  must collect 105 orbs during game play.
  
Scene Player Act 3 cheat: To get this you must
  collect 125 orbs during game play.
  
Reverse Races cheat: To get this you must
  collect 135 orbs during game play.
  
Level Select cheat: To get this you must collect
  145 orbs during game play.
  
Unlimited Ammo cheat: To get this you must
  collect 155 orbs during game play.
  
Unlimited Dark Jak cheat: To get this you must
  collect 165 orbs during game play.
  
Invulnerability cheat: To get this you must
  collect 175 orbs during game play.
  
Hero Mode cheat: To get this you must collect
  200 orbs during game play. When this cheat is activated, start a new
  game to begin with all four morph guns attachments and an alternate
  secrets list.
  
Alternate scrap book: To get this you must
  collect 200 orbs in Hero Mode