All Ecos and Power Cells:
At the beginning of any level press Up, Left, X, Right, Circle, Square, L1, R2, L1, Down, X. You will immediately be credited with all Ecos and Power Cells.

Alternate ending:
Successfully complete the game after collecting 101 Power Cells.

Faster credits:
Once the names of the Naughty Dog staff have been shown and have disappeared off the screen, hold X or Circle, The credits will speed up and be completed in a few seconds.

Hint: Faster Zoomer:
Hold L1 + R1 to go faster on the Zoomer, at the expense of maneuverability.

Hint: Shoot cannons farther:
To make the cannons at Misty Island and Sentinel Beach shoot farther, hold Square or Circle + X. This helps with any steel boxes.

Hint: Super jump:
Press L1 + X. If timed correctly, you will go into a crouch position and spring higher that you would by double jumping (X, X).

Do the rolling jump, then just as you touch the ground, press X. You will jump as high as the double jump.

Hint: Avoid fall damage:
Press Circle to spin kick just before you hit the ground and you will land perfectly every time.

Hint: Swim faster:
Instead of holding the Analog-stick in the direction you want to swim, keep tapping the Analog-stick in that direction. By doing this, you will move about twice as fast.

Hint: Flying:
In training mode, get Blue Eco to go through a door; instead jump off the mountain side with rocks. If done correctly you will be flying until the Blue Eco runs out.

Hint: Defeating the Giant Plant:
At the Giant Plant in the Forbidden Jungle level, run from the first spike bug until the spikes go in, then destroy it. The plant will try to eat you. Dodge it, and it will go to sleep. Jump up on the leaves and hit the flower part. Repeat this another two times. After he collapses, jump on his head and an orb will appear. Jump on the head until no more orbs come out.

Hint: Defeating the Klaww:
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.

Hint: Get to Yellow Sage:
When you get to Gol and Maia's Citadel, free the Blue Sage first and go on the Blue Eco platform. Roll, then jump off. You will be able to free the Yellow Sage without having to go through the obstacles. Note: This may require some practice to avoid falling.

Hint: Power Cells:
Go in the Forbidden Forest and talk to the person that is standing on a bridge. If you catch 200 pounds of fish, he will give you a Power Cell and let you ride his boat until dark.

To get the electricity to work for Sandover Village. go into the Forbidden Jungle and go behind the big building. There should be a little building on the right. Get on top of it and break the mirror by kicking it in the air. Follow the beam to the next pole. Keep on doing this until it is done, then go to the mayor for a Power Cell.

Hint: Dark Crystal locations:

Hanging in Gnawing Lerker area. Same height as the power cell. It is easy to shoot and find.
On the way to the Robot area. It is harder to shoot, easy to hit, and easy to find.
Near Dark Cave entrance. It is easy to shoot and find. Use platforms to hit.
Near Dark Cave entrance. Cross Dark Eco with platforms. You should be able to find some clean water on the other side of some Dark Eco. You must use the rolling jump (L1 or R1 and jump when you finish rolling) or you cannot get across the Dark Eco. Swim down and get close enough and it will explode. It is difficult to get to.
In Dark Cave, after you pass the second hanging spider and before the first rotating platform. Near the crystal that is after the second spider, you can find some clean water. Swim down and get close enough and it will explode.

Glitch: Walking on Sad Guys back:
Go on stairs behind him and walk forward.

Glitch: Stand on Yakkows:
After you round up all the Yakkows in their pen for the farmer, get next to or on top of one. Press Circle and the Yakkow will moo. Quickly jump on top of it. Instead of hopping off like usual, you will stand on its back for a little while.

Glitch: Stand on Points:
On Geyser Rock, go straight until you reach the Points, but do not go over them. Stand slightly away and slowly walk to the Points. If done correctly, you should be able to stand on one of the Points. Do not move around a lot or else you will lose a health point.