In Mega Man 6, Fire Boys appear exclusively in the Oil Field (Flame Man) stage, where they are one of multiple enemy types that can interact with the stage's oil gimmick. They are stationary foes that hurl flames randomly in either a short or a somewhat longer arc, which disappear when they touch the ground. Though the flames can hurt Mega Man, the greatest threat stems from the Fire Boys' ability to ignite the oil pools they are often placed beside and turn them into fiery pits that act like instant-death spikes, a trait shared with the Fire Telly enemies found earlier in the stage.
Once the oil has been ignited, it never stops burning, even after Mega Man loses a life, making Fire Boys a rare example of an enemy that can permanently affect Mega Man's progression through the stage (unless the player restarts the stage entirely).
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