Samus's primary weapon is her Arm Cannon, which fires various Beam types. You start with the basic Power Beam. The Charge Beam allows you to hold down the fire button for a more powerful shot. The Ice Beam freezes enemies, useful for combat and creating platforms. The Spazer Beam fires a wider, multi-shot blast. The Plasma Beam is a powerful, piercing shot that can hit multiple enemies in a line. All Beam upgrades stack, meaning you'll fire a charged, ice-spazer-plasma beam by the end of the game. Each Beam upgrade is found in a specific area and is often required to open corresponding colored Beam Doors. Experiment with charged shots and rapid fire to see what works best against different enemies.
