To get too those worlds you have to beat the world 2 and 5 booses MINI.Although Petey pirhana is skippable because of the world 4 ghost house secret exit,tippikle of nintendo making the hard one nessacery to get one,because mummy pokey is hard,I died like 10 times.A good mummy pokey strategie is to jump on him twice or slam him once to do2/3 damage then equip mini mushroom for thew third hit,to hurt him mini you have to ground pound though.How is Mario Kart ds coming along?