Red block (Wario: Master of Disguise)
From the Super Mario Wiki
A red block is an object from Wario: Master of Disguise. They are rocky blocks with flames burning in the middle which appear frequently throughout the game. Wario can push them around and stand on them like other blocks in the game. Once Wario obtains the Dragon Guise Gem, he can turn into Dragon Wario and destroy red blocks with his fire breath. There is a blue variant of these blocks which can only be destroyed after Wario obtains the Dragon Mastery Gem, which turns his flames blue.