I wanted to make something that I wish I had when finding all the stickers in this game. Some of them are very annoying to find and will have you looking all over the place and restarting the level multiple times. It should go without saying but if you don't want to be spoiled at all you probably shouldn't read this and go find them for yourself. Also you should be using Prince View to find the stickers since the game points the camera down at the katamari and out of view of most stickers.

Tip #1
Don't worry about the timer. In almost all non make a star levels the sticker can be found at your default size.

Tip #2
For the make a star levels the sticker is always in a place that is newly revealed to you as the player. For example, in make a star 2 you can find the stickers outside of the starting bedroom area since that part of the level is new to that level. In other words you shouldn't usually be backtracking to find a sticker.

Tip #3
A lot of stickers require you to look at an object at another angle. The camera angle when playing the game will almost always put the sticker out of sight.

Tip #4
You very rarely have to pick up an object to reveal the sticker.

Tip #5
Pretty much every sticker is within the bounds of the playable level. This also means in larger levels where there is a lot to look at, you shouldn't be following the outmost perimeter of the level except for the case of like two stickers. Also, if the level is very large the sticker is within the size goal of that level.

Tip #6
Some of the stickers are very small. Especially in levels that are very small and the sticker isn't obvious, you should expect the sticker to be very small.

Tip #7
A few of the stickers are very close to where you spawn in the level.

I think that is all I want to say. If anyone thinks of any other tips, let me know. Also if anyone thinks these are misleading also let me know and I can try and amend it.

Good luck!!