Carnival Cruise Line is betting that the best way to sell a cruise to younger travellers is to let them play it. The line has launched "Play Carnival," an interactive livestream on Twitch set aboard Carnival Celebration, where viewers vote in real time on what happens next on the ship.

The star of the show is tech YouTuber iJustine, who plays as herself roaming Celebration and tackling challenges across the vessel. Fans watching on Twitch, Instagram or TikTok get to direct her route and pick which side quests she takes on, while Carnival Fleet Cruise Director Erin Weigand acts as co-pilot — passing along viewer requests, running new challenges and generally keeping things moving. The running storyline: iJustine trying to earn her Cruise Director badge.

There's a game-over mechanic, too. A live "Fun Meter" tracks the energy of the stream, and if it drops to zero, the run ends. The idea is to keep both the player and the audience engaged enough to stay in the game.

The ship itself is the game board. Carnival says Celebration's venues and activities, plus destinations from its Paradise Collection, have been deliberately woven into the gameplay as challenges, side quests and surprise moments — effectively a playable tour of what a Carnival holiday actually involves. There's also a hook for viewers: chances to win a Carnival cruise by taking part.

The livestream is scheduled for Sunday, November 15 at 10:30 AM EST, running simultaneously on Carnival's Twitch, Instagram and TikTok accounts. It's the latest activation under the line's "Carnival Is Calling" brand platform and its new "Find Your Fun Again" campaign.

For cruise watchers, this is a reasonably clever piece of marketing with a real payoff: anyone curious about Celebration — one of Carnival's newest and largest ships — gets an unscripted, viewer-driven look at its spaces and activities without committing to a booking. And unlike a polished promo video, the interactive format means the content changes depending on what the audience votes for. If you're weighing up Carnival as a first cruise or considering Celebration specifically, tuning in is a low-effort way to see the ship in action. It's also a sign of where cruise marketing is heading: lines increasingly chasing Gen Z and millennial travellers on the platforms they already use, rather than waiting for them to browse brochures.

The stream is free to watch on any of the three platforms — no booking, app or account beyond the platform's own sign-in required.