I'm not too terrible versed in what the missiles are needed for (I know, but the layout still eludes me), but 9% Hard is supposedly only doable in the European version (Japanese, too?). What you're suggesting, either 4 Missiles or 2 Missiles + 1 Super Missile, is 10%.
Morph Ball Missiles Bombs Plasma-Beam Power Grip Ice-Beam Gravity Suit Space Jump Varia Suit
^^ the 9% minimum. Plasma Beam, Gravity Suit, and Space Jump are all required. If you choose to skip Varia Suit, it's still given to you automatically once you get your suit back in Chozodia.
You need at least three missiles to get through a certain section of the mother ship, Hard mode only gives you 2 missiles per tank, Pirates don't drop missiles, and one save room in that section has been taken out for Hard mode (for some reason).
The difference in PAL is that if you destroy a missile block, leave, and come back later, it's still destroyed so you can refill your missiles at the previous save station.
Read the 15% thread for more help on minimalist runs, as you apparently aren't actually doing a 9% run at the moment.
Also, please, at least try to make your posts easier to read. U is not an acceptable abbreviation for You here. Read the forum rules and policies thread for our forum rules and policies.