Little Big Planet online does not exist; if you are referring to lbp.me, then you must make the levels on your ps3.
Make a really good level
Make a good level
You just make a Mortal Kombat level that's a fighter
Make a good level
Use options to make it a favorite
Just make a good level.
You just go to create mode and make anything
There is a glitch to do this. Just consult the level '3D level glitch' for more info
All you do is go to the level edit and change it to versus i think that's how it is.
Complete story mode and use the stuff from story mode to create your level.
Use the corner editer. Use the grids to make stairs.Make sure to listen to the tutorials. Have a friend play your level before you publish it.
there is no official Mario costume, but check some online levels, I bet you can make one there.