GameRadar has 32 cheats, tips, hints, unlockables, and FAQs for Jak 3 for PS2.
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Farther Grenade Launcher In The Dune Hopper
While riding in the Dune Hopper jump and then
shoot a grenade and it will go much farther.
Lots Of Ammo
When you are in haven city, if you go to an area
where the guards are fighting KG bots, you can
get a lot of ammunition. Most KG bots will give
you ammo after you kill them, and they will never
stop coming. They usually give you ammo for the
gun you kill them with. (they will also
sometimes give you health.)
Submitted by: basketballstar24
Unlimited Light Jak Flight
After buying it in secrets, keep hitting X and Circle.
Two Wastelanders Fighting In Wastelander City
Go into the Wastelander City and shoot one of the
Wastelanders. They will begin to shoot at you.
Quickly run behind another Wastelander, and the
one you shot will continue trying to shoot you,
causing him to shoot the one that you are hiding
behind. They both will begin shooting each other
until one dies.
Defending Front Gate In Spargus City
In the mission where you have to defend Spargus's
front gate, the best car to use is the Dune Hopper
or Dust Demon because of their grenade launchers.
They should take out the Catapult Launcher in two
hits.
Guns And Cars In Spargus City
When in the garage, shoot the cars there and
destroy them. You will restart from inside the
garage. The only gun that will not affect them is
the Mass Inverter. All it does is make the cars go
up in the air.
Light Eco In Spargus City
Around the corner from Krew's garage in Spargus
City, you will find a Light Eco Vent. Also in
Spargus City, there are rats running around that
will give you Dark Eco and very rarely Light Eco.
Defending The Naughty Ottsel
In the level where you must defend the Naughty
Ottsel in four different areas, the third is
probably the most difficult. You must destroy all
the robots and protect three people as well. If
they all die, you lose. If you are having trouble,
keep dying on purpose. Eventually you will get
more people, and you will only lose if they all die.