At the Klaww in the Mountain Pass level, dodge the boulders. The last one he throws will
contain Blue Eco. Get it, and a bridge will appear. Run to the end, dodging the boulders
as you go. Get the Yellow Eco at the end, and when he starts to make a big boulder, fire
away. Keep blasting him until he drops the boulder on his head, then run back to the
first three platforms and repeat the process another two times. untill he is dead
please rate me !!!!!!!!!:):):):):)

to get the secret ending collect 100 power cells or 101 
when you beat the gol and mia boss a cutscene will come on and they will discover a
precursor door you jak then fills it with 100 power cells and the door opens it doesnt
show you what was inside but it is later explained in jak 2

ok this isn't really a cheat but it's a good hint. ok first get on the zoomer and get as
much blue eco as you can. Whatever you do, don't hit any obstacles or you'll lose your
blue eco boost. do this manuever and you'll be ahead of those pesky lurkers in no time!