Looks like Best Buy has more Nintendo goodies than just E3 demos.

According to a Tweet by Nintendo of America, buying Donkey Kong Country Returns 3D from Best Buy will get you a free copy of Super Mario Bros.: The Lost Levels. The promotion is for the US only, and while stocks last.

Nintendo had also recently announced that they would be teaming up with the electronics retailer to bring E3 demos to Best Buy stores.

Donkey Kong Country Returns 3D released on the Nintendo 3DS in North America just a couple of days ago (May 24), read our review here.