Ratchet & Clank: Size Matters

Well, there are 3 parts.
For part 1, when there are airplanes coming, trying to shoot u, just move left or right.
For part 2, when there are rocks falling, move around in zig-zags and circles.
For part 3, when Luna starts to attack, people say to use the Lacerator. What I did was i went to the Gadget Shop, and brought a Shock Rocket, which does a lot more damage. Luna at first will rush forward using her harvester. Just jump. Now, she will face you, and there will be 3 red dots on the harvester, 1 in the middle, 1 on the left, and 1 on the right. She will shoot at you twice, just jump. About halfway across Luna's health, she will turn onto a helicopter, and shoot poison gas bombs. There will be targets where Luna will shoot them. It's easy to doge. Then, she the red dots appear, and she will shoot you in 1's 3's and 5's. Jump to dodge.