In Zelda a link to the past/ nintendo i am missing something but i don't really know what it is?

well i have the bow and arrow, bomerange, the slingshot thing (which you can throw and grab urself and move over), bombs, magic potion, fire rod, icerod, ether, quake, bombos, 4 bottles, flute, magic mirror, hammer, book, lattern, ithink thats all but point is there is a space empty where something belongs