A new commercial for Super Smash Bros. Ultimate and the Nintendo Switch has inadvertently leaked one of the new modes coming to the game, Stage Builder!

This is probably the best thing they could have done! This is next level stuff if it’s well made.

The Stage Builder from Brawl was well done if a little fiddly at times but I heard the Wii U one improved on it a lot.
Hopefully they will add a lot more customisation options.