The main body of Pyrosphere is a fairly long platform with a metallic surface mounted on top of a tall metal shaft extending down below the surface of the lava. Above it floats four metallic platforms sporting green glowing strips wrapped around them. The lava appears pouring in the background, but doesn't affect the playing area.
Ridley appears periodically as a boss, who will attack players and destroy floating platforms. He can increase his strength from absorbing energy from the tanks under the ledges, which blackens his skin in the process. If he receives enough damage, he will become an ally to the last attacker. Defeating him counts as a point in Timed matches. FG II-Grahams, Joulions, and Zeros appear as enemies on the stage as well. FG II-Graham units are mobile flying turrets that fire straight shots when hit. Joulions are floating enemies that inflate and explode after being attacked. The weighty Zeros crawl slowly on the ground, and can be picked up and thrown.
Pyrosphere is banned from tournaments due to the random and disruptive nature of its hazards. This applies to the FG II-Grahams, Joulions, and Zeros, but most importantly to Ridley: his attacks cover large portions of the stage, he can take attacks intended for other players due to his massive size, and he gives the player he sides with a very significant advantage, KO'ing characters at unrealistic percentages.
The Pyrosphere is a significant area in Metroid: Other M. The stage in Super Smash Bros. for Wii U is based on the Geothermal Power Plant within the Pyrosphere area inside of the Bottle Ship. It is there that Samus Aran would encounter and battle the newly-cloned Ridley. This area's appearance in Other M is mostly the same as it is in SSB4; the bridge that Ridley burns down, the magma-eruption port that Samus destroys to light the area, and the hole in the wall that Ridley creates while escaping are all in their post-battle state in SSB4, though the hole has been moved slightly to the right and there is another hole to the right of the door for unknown reasons. Also, the four floating platforms of the stage are not present in Other M.
During the fight at the Geothermal Power Plant against Ridley, he could harden his skin to render himself invulnerable to Samus' Plasma Beam, signified by his darkened skin. In SSB4, he absorbs the energy from the vats on either side of the stage to further augment his strength. The result is erroneously stated as a transformation into Meta Ridley.
The main platform is used in the Omega form. Ridley, enemies, and smaller platforms do not appear.
Attacking Ridley with the Dragoon when he is about to dive onto the stage will make him function in the background instead of the foreground. However, his fireballs remain potent, and he can still destroy the floating platforms. In this state, he can only be defeated by the use of Dragoons.
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