Brinstar is the default Metroid stage that first appeared in Super Smash Bros. Melee. This stage is based after the first area of Planet Zebes from the original Metroid. The stage consists of a base platform, two sides held by fleshy stalk-like poles, and a hovering metallic platform in the centre. There is another fleshy substance in the middle of the base platform that holds the stage together.
The main feature of this stage is the acid which rises from the bottom, which will damage anyone who touches it, and has large knockback (though it can prevent characters from being KOed from the bottom). The acid will periodically rise high enough to cover the entire stage, save the top-most platform, forcing players to retreat there to avoid damage. There is also a lone Chozo statue in the background which occasionally gets up and walks around. The fleshy stalk-like poles and substance can be destroyed, the latter of which will separate the bottom platform, breaking the stage in half. Both of the destructible substances will start to regenerate if they are not continuously attacked. While regenerating, the substance that holds the stage together is fall-through. After being destroyed, they will grow back once a certain amount of time has passed.
Brinstar is essentially a redesign of Planet Zebes, from the original Super Smash Bros. As Brinstar is also available at the start of Super Smash Bros. Brawl as a Melee Stage, this makes it one of only two stages that has been playable in all three games, the other being Corneria.
Brinstar is the first level of the original Metroid, as well as its remake, Metroid: Zero Mission. The acid also debuted in this game; however, it did not move as it does here. The Chozo in the background of the main platform is taken from the first boss of Super Metroid.
- There are several references to Mother Brain in this stage. The fleshy stalks that connect the platforms have all the characteristics of the 'Zebetites' (life veins of Mother Brain) that Samus had to break before reaching the final boss in Metroid and Super Metroid. Also, it is common misconception that the gigantic alien organism in the far background is actually Mother Brain itself. However, the organism lacks several of Mother Brain's characteristics, such as her recognizable single eye, and the distinctive "wrinkles" and ridges of her brain. The organism seems to be more of a Chozo Statue, which were used to help Samus in some of her games, than Mother Brain.
- If the poles on either side of the stage are broken, the platforms that were being supported will tilt at a very sharp angle.
- Near to the Chozo Statue are bricks with angry faces. These appeared in the famous "Morph Ball room" in the original Metroid.
- Even though the main platform is very thick, any character can pass through it from below, but not above.