The Arm Cannon is a weapon used by Samus Aran. It is a feature of her Power Suit that lets her shoot out various things, such as a normal Power Beam, to the powerful Plasma Beam. This item is very useful. There are many beams for the Arm Cannon, such as the Light Beam, Dark Beam, Wave Beam, and more.
Metroid is the very first game in which the Arm Cannon has appeared. The Arm Cannon appeared as a little Green object on Samus' hand, and it shooted out what appeared to be small balls instead of the actual beam. The beam couldn't go very far, either.
 Metroid II: Return of Samus
In Metroid II: Return of Samus, the lack of color took quite a toll on the essence that the Arm Cannon and the various beams, because it only showed Black and White coloring. However, the beam was fairly similar than in Metroid.
 Super Metroid
Super Metroid was a very good game when it came to showing the Arm Cannon, as it actually had better graphics so you could see if you were shooting out an Ice Beam or Power Beam. The graphics in this game made it feel more realistic.
 Metroid Fusion
In Metroid Fusion, the Arm Cannon took on an odd change when Samus was attacked and infected by the X-Parasite, as here whole suit went under changes. The various beams took longer to obtain, and the coloring of your whole suit was changed. This gave a new feel to the Arm Cannon.
 Metroid: Zero Mission
In Metroid: Zero Mission, the Arm Cannon felt very similar to as it did in Super Metroid and Metroid Fusion, as the graphics were the same. As well as this, the beams and overall feel were the same as well.
 Metroid Prime
In Metroid Prime, the feel changed alot when it came to the Arm Cannon. Seeing as the game switched to a third person perspective for the first time, it was new and very different. Also changing the feel were the graphics of the game, due to the GameCube's graphic capabilities. Also, switching from the GameBoy's controls to the GameCube's was different.
 Metroid Prime: Hunters
Yet again, the feeling of the Arm Cannon changes, as you are now playing on the Nintendo DS. This game was also in third person. In Metroid Prime: Hunters you moved the stylus on the screen to aim, and fired using the shoulder buttons.
 Metroid Prime 2: Echoes
In Metroid Prime 2: Echoes, the game was also in third person, so you kept the same essence of the Arm Cannon. The beams, however, in this game, were the ones that changed. Now introducing the Light Beam and Dark Beam, it added much creativity to the already creative Arm Cannon.
 Metroid Prime 3: Corruption
Now getting used to the third person perspective, the Arm Cannon gets revamped with the power of Phazon and the PED Suit. Now infused with Phazon, the Arm Cannon can fire many powerful shots at once, in a rotating motion. This added more fun to the Arm Cannon, and with the added use of Hypermode it made it all that much more unique.
 Metroid: Other M
This is the last game in the Metroid Series to date, and also one of the most recognizable titles. Now on the Wii, the graphics are cinematic. This makes the Arm Cannon truly amazing, and now you are back to the old style of Metroid. You can switch to a third person perspective and back. This game is truly one of the best, and shows the Arm Cannon in all of it's glory.
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