From the Super Mario Wiki, the Mario encyclopedia
Pyrosphere is a Super Smash Bros. for Wii U stage representing the Metroid series, and is specifically based off the location appearing in Metroid: Other M. The stage holds up to eight players in both its regular and Omega forms.
Pyrosphere is set in the Geothermal Power Plant, and features a large base platform and two smaller platforms on both sides of the stage. Enemies from the game occasionally appear and attack players. These include FG II-Grahams, flying turrets which shoot at players; Joulions, which explode after being attacked; Zeros, which can be picked up and thrown; and, most notably, Ridley. Ridley will attack all players, but if attacked by a specific player enough, Ridley will join sides with that player, and will cease to hurt him or her. Ridley can also be KO'd, which adds a point to the player that defeated him.
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