From what I heard, from Astro Man.

Astro Man is a Robot Master who debuted in Mega Man 8. His original job was to work in a planetarium, but Dr. Wily stole him and modified him for combat. Astro Man uses his abilities to confuse his opponents and then attack them with either his two orbs levitating around him or his Special Weapon, the devastating Astro Crush.

When you enter his stage in MM 8 and fight him, he is in his room and creates virtual space with multiple planets and stars, when he dies, it disappears along with him.

In the Mega Man & Bass, when you enter stage once again, there can be seen multiple stars and possibly some galaxies throughout the level.

In the Mega Man & Bass CD data, it is written in the Japanese version, he can control dimensions and create a simulated universe.

When Mega Man copied Astro Man‘s ability, he gets Astro Crush in MM8, Astro Crush is Astro Man's Special Weapon in Mega Man 8. It creates a meteor storm that hits all enemies on the screen, and Mega Man himself is invincible for a short time when using it.

And in Mega Man & Bass, they either of them defeated Astro Man, they get the Copy Vision, Copy Vision is Astro Man's Special Weapon in Mega Man & Bass. When Mega Man or Bass uses it, a holographic copy of them appears forward their current position to shoot at enemies. The copy fires twenty-eight shots before disappearing.

As you can see, the stuff that Astro man creates, or people who have his power, can create and materialize things into real life, which can actually to damage to non virtual matter.

Keep in mind please that I don’t completely agree with it but just wanted to mention it to see other’s opinion on it.

(There also other Universal claims in further future games, X, Zero and ZX but Rock doesn’t scale from that of course)