My sheet was stolen.

[Alefy San]

Mario Universe grabs sheets from all over the place and throws them on their site, most of it is completely outdated and low quality.

They don't change the contents of the sheets and leave credit tags intact, though. Therefore your sheet was not really stolen, since they don't claim your efforts as their own. These people just didn't ask you for permission to have your rips on their servers.

I guess they have stuff from me too, but I don't really care. If it bothers you, try to contact them and ask them to remove your sprite sheets: https://www.mariouniverse.com/contact/

I didn't knew it. I am just a little upset because they don't gave credit, because my sheet doesn't have a credit tag . I guess I'll try to have a credit tag from now on, so next time they can give credit.

Edit: After thinking for a while, you're right. It's not me who created those sprites, I just ripped it, therefore I can't claim credit, specially if ripping is my hobby. I guess it's better to not have a credits tag.