First you must have a blue shell in your evevtory go to the world 1 bowser junier lvl when you get to the first pipe that shoots you up, fall back down then you will see a door on your way back down go into it and there will be a star coin and a lot of moving block apart from 2 at the top right hand side try and run there and get thru them if you go further on u will see some blocks and a pipe (dont go thru the pipe) where your blue shell and smash the blocks then there will be sum more blosk so smash the and the go thru a pipe you will end up out side the castle and just go on then jump on the flag and you will have the world 1 cannon to get you to world 5.