Nintendo Accidentally Leaks Bob-omb Blast for Mario Kart World in a Since-Deleted MAR10 Day Post

TL;DR: Nintendo posted a Mario Kart World tournament screenshot to its My Nintendo website ahead of MAR10 Day (March 10) and quietly revealed an updated Battle mode icon featuring a Bob-omb — a character not present in the game’s current menu. The post was quickly deleted, but fans had already screenshotted it. The change strongly implies Bob-omb Blast, the fan-favorite chaos mode from Double Dash and Mario Kart 8 Deluxe, is coming to Mario Kart World as a content update around March 10. Nintendo has not officially confirmed anything yet.

Nintendo had one job: post a tournament announcement without spoiling an upcoming content update. It did not do that job.

Ahead of MAR10 Day — the annual March 10th celebration of all things Mario — Nintendo published a post on the official My Nintendo website about an upcoming Mario Kart World Open Series tournament running from March 5 through March 25. The post itself was routine enough. But tucked into one of the accompanying screenshots was a detail Nintendo very much did not intend for anyone to notice yet.

What the Leaked Screenshot Actually Shows

In one of the screenshots included in the post, the icon for Battle mode appears different from what’s currently in the game — a Bob-omb can be seen alongside a balloon and a coin, which represent the two existing modes: Balloon Battle and Coin Runners.

That Bob-omb has no business being there under the current version of Mario Kart World, which launched alongside the Nintendo Switch 2 in June 2025 with only two Battle mode options. Mario Kart 8 Deluxe, for comparison, shipped with five Battle modes — including Bob-omb Blast.

Nintendo has since pulled the post, which many fans are reading as a quiet confirmation that it did, in fact, accidentally reveal an update that’s planned for Mario Kart World. The internet, naturally, was faster.

Mario Kart World Daisy going over a jump with a Bob Omb overlaid on top

Bob-omb Blast: A Series Staple That’s Been Notably Absent

Bob-omb Blast first arrived as a Battle mode in Mario Kart: Double Dash on the GameCube, where players were given nothing but Bob-ombs and tasked with blowing up opponents to score points. Being hit would cost points, and the first player to reach three was the winner. The mode returned in Mario Kart 7 and Mario Kart 8 as an optional item rule, before formally coming back in Mario Kart 8 Deluxe — this time giving players five balloons that would be expended with each Bob-omb hit.

Its absence from Mario Kart World’s launch lineup was already a talking point among longtime fans. The mode is known for its frantic, unpredictable pace compared to standard Balloon Battle, and it has consistently ranked among the most-requested Battle additions wherever the community has discussed the game’s post-launch roadmap.

The Community Reaction: Excitement — With a Side of Bigger Questions

Fan response to the leak has been enthusiastic, though the most insightful comment circulating on the Mario Kart World subreddit isn’t just about Bob-omb Blast itself. As one Reddit user put it: “The big thing here isn’t Bob-omb Blast itself, it’s that this confirms a decently major content update will release.”

That framing matters. Mario Kart World has sold well over 14 million copies worldwide since launch and holds an 86/100 on Metacritic, making it one of the Nintendo Switch 2’s flagship titles — but its post-launch content cadence has been modest compared to what some fans hoped for. A confirmed Battle mode addition would be the first of its kind since release and would signal that Nintendo views the game as an ongoing live title rather than a finished product.

The possibility that Bob-omb Blast could arrive as part of a larger update — rather than as a standalone addition — is also being discussed, with some fans speculating that additional modes or content could accompany it.

Whether such an update would be free or tied to a paid content pass also remains an open question. Mario Kart 8 Deluxe set a precedent with its Booster Course Pass, so a similar model for Mario Kart World isn’t out of the question — though nothing along those lines has been announced.

For a sense of how much Nintendo’s gaming ecosystem is expanding right now, it’s worth noting that Warframe also just confirmed its Nintendo Switch 2 release date for March 2026 — the platform is quickly becoming a serious destination for big multiplayer titles.

When Could Bob-omb Blast Actually Arrive?

The Mar10 Day tag sits atop the leaked screenshots, making March 10th the most likely target for any official announcement or content drop. Nintendo has historically used MAR10 Day to deploy sales, new content reveals, and smaller updates tied to the Mario franchise — making it an appropriate window for something like this.

If the update does land on or around March 10th, players won’t have long to wait. Nintendo has not commented on the leak as of publication.

What About Renegade Roundup?

While Bob-omb Blast is drawing the most attention, it’s far from the only Battle mode fans want to see make the jump to Mario Kart World. Renegade Roundup — the cops-and-robbers-style mode introduced in Mario Kart 8 Deluxe — has its own vocal fanbase calling for its return. Whether this update paves the way for more modes down the line, or whether it arrives alone, will tell players a lot about Nintendo’s broader content ambitions for the game.

For now, eyes are on March 10th. If Nintendo’s own accidental screenshot is any indication, it’s shaping up to be a good MAR10 Day.

It’s been a big week for gaming news leaks and surprise announcements — Ubisoft’s accidental Assassin’s Creed Black Flag Resynced reveal and the Slay the Spire 2 vs Marathon Steam launch story are both worth catching up on if you missed them.