Explosive Crates are bombs that explode if destroyed. They can trigger a chain reaction as long as adjacent crates have the same color as them. The destruction is similar to the chain reaction of TNT blocks. Hot Plates can also destroy them if they are heated.
They come in four colors: red, green, blue and purple. The two earlier colors come from Mega Man & Bass, while the two latest colors come from Mega Man 8. While the level object appeared first in Mega Man 8, the sprite's design is inspired in the one it had in Mega Man & Bass. There were cylindrical variants of the crates, but it is unknown if they are included.