Samus's primary weapon is her Arm Cannon, which can be upgraded with various beam enhancements. These beams stack, meaning you retain the properties of previous beams while gaining new ones, unless specified otherwise. Cycling through beam weapons is not possible; they are automatically combined.
- Power Beam: Samus's default beam weapon. Fires a single, weak shot.
- Long Beam: Extends the range of the Power Beam, allowing you to hit enemies and blocks from further away.
- Ice Beam: Freezes most enemies solid, making them vulnerable to Missiles or allowing you to use them as platforms. Essential for Metroids.
- Wave Beam: Allows Samus's beam shots to pass through walls and enemies, hitting multiple targets.
- Plasma Beam: The most powerful beam upgrade. Fires a concentrated, piercing shot that deals massive damage.
Each beam upgrade significantly increases Samus's offensive power and utility, making combat easier and opening up new strategic options. The combination of all beams makes Samus's Arm Cannon incredibly versatile and deadly.