i beat the game 1nce and in challenge mode how and what is the last item after that map thingy
either bolt grabber or nano-pack
nano-pack=crash site, after 3rd larde flying robot you will see an elevator, kill all guys then face right from the elevator and hookshot into a ship. The nano-pack is at the back of the ship
bolt grabber=zeldren starport, instead of going with quark, go forward. Keep killing and fighting 'til you get it