Samus is a playable character in the Brawl mod Project M. In Project M, her attributes have been restored to how they were in Melee, alongside considerable buffs and a slightly altered moveset that is accessible via her side taunt.
Samus ranks 27th out of 41 on the official tier list, near the top of the C tier. This placement is significantly lower than her Melee placement, where she is ranked 10th out of 26, however slightly higher than her Brawl placement, at 32nd out of 38.
Samus is a heavy fighter who is unusually floaty, a characteristic defying those of her weight class. She utilizes a unique array of powerful projectiles in her arsenal, including Charge Shot beams, missiles, and bombs. Additionally, new to Samus's Project M iteration, using her side taunt allows her to switch between either fire and ice elements (with the former being default). This mechanic changes the elements of her forward smash, forward air, up smash, down tilt, and missiles (unusually, it does not change the element for her bombs), which allows Samus to utilize a new set of skills that players are able to use in strategic methods.
Samus does have her flaws, however. Despite being a heavyweight, Samus's vertical endurance is slightly below average due to her very slow falling speed (having the worst vertical endurance of the heavyweights); it also causes her to be easily juggled. Additionally, despite being floaty, Samus's recovery is below average should a few elements be absent, due to a relatively low air speed. Also, her recovery move, Screw Attack, offers very little horizontal and vertical distance (with the former especially occurring should Samus not gain any prior momentum, similar to Link's Spin Attack from Brawl). Samus can, however, improve her recovery by using both her bomb recovery technique and grappling beam for a tether recovery in conjunction.
In addition, she has a below average aerial approach due to her low air and falling speed, resulting in Samus receiving a poor SHFFL, despite her aerials generally having little to no endlag in her aerial attacks.
Changes from Brawl to PM
Grabs and Throws
Changes from PM to P+
Up to date as of version 3.6.
In competitive play
Samus had three new costumes added in version 3.5. They are based on the Classic Power Suit, Light Suit, and Fusion Suit. The Fusion Suit-colored costume has also been changed to resemble Dark Samus.
Version 3.6 replaced the Dark Suit color scheme with the actual Dark Suit, and gave all her other alternate costumes brand new aesthetics.
An unreleased patch reveals Samus would have had an alternate costume based off the PED Suit from Metroid Prime 3: Corruption, which would have given her five model swapping costumes.
In Project+, Samus is one of few characters to have their overall design changed. Her new design incoporates elements from the Metroid Prime series and Metroid: Samus Returns.
All costumes introduced in Project M were modified to match the proportions of Samus' new design. In addition, the previously unused PED Suit in Project M is now properly implemented as an alternate costume, sharing the same modifications as her other costumes. The Fusion Suit also received recolors inspired by the suit upgrades in Metroid Fusion for team battles.