How can I play free Super Mario Bro games online?

I need help my XBoxis broken and I really want to play Super Mario Bros online free---without having to download all that junk that slows your computer down.but I do know theres a site out there somewhere,Ive used it years ago,I just cant remember,but it would really help if someone could provide the site for FREE online Super Mario Bros.|||go to virtualnes.com it has alot of old classic NES games|||go to addictinggames.com in the corner of the page there is a search page search mario and it will come up with some results