This will cause the whole game to restart EXEPT, the items you carry at the time, this means if your at the mother brain, you can play the whole game WITH ALL ITEMS, BUT, you will NOT have missles, because in the open video it gives samus four missles to use and then takes them away. to do this you have to be in a fairly large room, NOT ALL BIG ROOMS WILL WORK, then use the murder beam WITHOUT WAVE BEAM EQUIPED, fire the beam and then leave the room without fireing agian, after that go save your game and then restart, you will have all items.
This allows you to eqiup all beams at once, first, face left NO DIEAGNALE, start chargeing with CHARGE,ICE,WAVE,SPAZER, then hit start, DON'T LET GO OF CHARGE, on your item screen go to SPEED BOOSTER, then hit LEFT and FIRE at the same time to eqiup all beams, you should see a VAR next to PLASMA, unpause and your charge should be green, WARNING! before firing hit start and turn of SPAZER or PLASMA, failing to do so will crash the game, this does not work on all emulators.
All you have to do is pause the game, and go to the "Samus Screen." Then turn off all of the beam weapons except for the Ice Beam and the Charge Beam. Select "Power Bombs" on the top of the screen. Charge the weapon for 2 seconds, then an Ice Shield will appear around Samus. That's how you do it.