after you get 15 stars, there should be a light in the middle of the castle; go into first
person view & look up(you HAVE to be mario);you will be flying and there will be 5
towers:go to the middle(the shortest one[you will see it as soon as you get into the
level]);jump on the red dome-ish thing and...PRESTO!!!you havthe red boxes!(your
welcome!)p.s. on some levels you get wings instead!

i use AR and give yoshi wings in ANY levle ^o^