Challenge

Challenge mode is an event mode which was added in Sizzle Season 2023. Officially a replacement for League Battle, Challenges are limited-time competitions of standard modes with unique in-match conditions. They can be played solo or with a team, and feature a two-hour ranked play window similar to League Battle, but unlike League Battle's constant rotations, the windows only occur at a few specific times during a season. The monthly event battles that appeared in League Battle mode were confirmed to return as Challenges. Winning 5 games in a Challenge awards the player with a Shell-Out Token.

Unreleased Challenges
Seven types of Challenges with unique conditions exist in the game's files but not yet have been revealed: "Foggy Notion", "Extreme Jump Battle", "Duel of Dynamic Duos", "The Sheldon Sampler Challenge", "Zip-to-It Zipcaster Challenge", and "Art Battle for the Ages".

Quotes
"Ballistics aside, we have an update about the League Battle feature from Splatoon 2. A similar feature is coming in Sizzle Season with a new name - Challenges! These are an exciting new way to battle with special rules for a limited time, and you can join solo or with friends."

- @SplatoonNA on Twitter

"A new mode - Challenge - is coming to #Splatoon3 in Sizzle Season 2023! Look forward to monthly challenges and events with special rules. Test your Turf War talent on a brand new stage in the first event, taking place 03/06!"

- @NintendoEurope on Twitter

Badges
Badges are available for reaching each tier of high score in any Challenge.