Nintendo posted an advertisement for Super Smash Bros. Ultimate on its YouTube channel on Tuesday. In the video, a young boy unlocks Inkling, joins his friends, and proceeds to impress them all with his brawling skills. Oh! There’s also a “Stage Builder” menu icon.

The menu option is visible at 0:02 in a blink-and-you’ll-miss-it moment. It’s a little blurry, but it’s definitely and unmistakably an option that reads Stage Builder. That mode has previously appeared in Super Smash Bros. Brawl and Super Smash Bros. for Wii U, and allowed players to create their own custom stages using a variety of components. But it’s not in the current version of Super Smash Bros. Ultimate.

The existence of Stage Builder — and the return of Home Run mode — were previously uncovered by dataminers, but Nintendo hasn’t officially announced the mode.

The next Nintendo Direct would be a prime time to discuss the return of Stage Builder in Ultimate. Fans are hoping for Super Smash Bros. Ultimate announcements, including the release date of Persona 5’s Joker. Now, thanks to a single frame of a video, they’ll also be hoping to hear more about Ultimate’s new mode.