[Underdark: Defense] April 1 Update - Stages are expanded up to 920. - The Season Pass will be updated. - Living Tower growth missions are added. - Living Tower heroes are buffed. - The “Unexpected Companion Chicken” hero is buffed.

[Underdark: Defense] Update - Added 4 new towers - Added new ranking dungeon “Silkworm Moth” - Added new limited tower pass - Reduced difficulty of Co-op Dungeon 1 - Fixed an issue where the Buff Reset +1 option did not stack

[Underdark: Defense] March 14 Update - New content Guild 4-player co-op dungeon added - New items 2 helmets and 2 rings added - Guest accounts are excluded from the Top 10 ranking - Spending ranking closing time adjusted to every Sunday 23:50 (KST) - In the spending ranking, guest accounts will start being counted after linking a Google or Apple account

[Underdark: Defense] March 13 Update - New content Guild 4-player co-op dungeon added - New items 2 helmets and 2 rings added - Guest accounts are excluded from the Top 10 ranking - Spending ranking closing time adjusted to every Sunday 23:50 (KST) - In the spending ranking, guest accounts will start being counted after linking a Google or Apple account

Fixed an issue where the weekly ranking currency changed at the wrong time. The weekly ranking currency has been changed back to Diamonds.

Fixed an issue with claiming Weekly Currency Ranking rewards.

[Underdark Defense] March 1 Update - The Mysterious Armor hero will be remade. - The Mischievous Devil hero will be remade. - Stages will be expanded up to 910. - A Weekly Spending Ranking system will be introduced. - Co-op Mode stability will be improved.

[Update Details – February 2] Bug Fixes & Improvements - Fixed an issue in Daily Dungeon Multiplayer mode where some players could not press the entry button or the UI was not displayed correctly. - Fixed an issue where the Daily Dungeon Multiplayer ranking UI was displayed incorrectly. - Fixed an attack speed–related issue occurring in Daily Dungeon Multiplayer mode. - Balance adjustment: Gamblewood has been nerfed. - Gamblewood Lv.6 ability has been adjusted. (Max 2000% → 500%)

[Update Details – February 1] Hero Improvements - Hero Gamblewood has been revamped! - Hero Thor has been strengthened! New Dungeon and Special Notes - Normal stages have been expanded up to Stage 900. - 10 new stages have been added. - A multiplayer mode has been added to the Daily Dungeon. Events - The Bingo Mini-Game begins on February 1 (KST). - The 2026 Event ends on January 31 (KST). - The Board Mini-Game ends on January 31 (KST). Bug Fixes and Improvements - Fixed an issue related to guild levels. - Improvements have been made to pet summons.

[Update Details – January 1] New Hero - The Nine-Tailed Fox joins Underdark! - Defeat enemies together with the charming Nine-Tailed Fox! New Stages and Special Notes - Normal stages have been expanded up to Stage 890. - 10 new stages have been added. Events - The 2026 New Year Event begins on January 1 (KST). - The Board Mini-Game begins on January 1 (KST). - The Bingo Event ends on December 31 (KST). Bug Fixes and Improvements - Lava Golem optimization has been applied. - Lava Golem’s Fireball damage and movement speed have been increased. - A Curse Tower tutorial has been added to Stage 21.

[Update Details] Bug Fixes and Improvements - The issue where the ranking dungeon disappears will be fixed.

[Update Details] Bug Fixes and Improvements - The existing co-op dungeon will be added again. - An issue where the in-game scrollbar range becomes narrow will be fixed. - An issue where the Battery Tower was not affected by the Wind Boomerang will be fixed. - An issue where obstacles were displayed abnormally in Zombie Penguin Village will be fixed.

[Update Notes – December 1] New Hero - The Lava Golem joins the Underdark! - Melt your enemies with powerful Meteors and Fireballs! New Stage & Special Features - A new stage will be added. - A new co-op mode will be added. Events - The Board Game mini-event ends on November 30 (KST). - The Halloween event ends on November 30 (KST). - The Bingo event begins on December 1 (KST). Bug Fixes & Improvements - Fixed an issue where the “End of War” display appeared abnormally. - Expanded the maximum item level. - Added a support mercenary slot. - Added a feature that allows faster growth selection.

[Update Notes – November 1] New Hero - Succubus joins the Underdark! - Defeat monsters through the alluring mist of the Succubus! Hero Improvements - Fat Shark’s level 3 ability has been enhanced. - Plague Doctor’s level 12 ability has been enhanced. New Stage & Features - A new stage will be added. - Account level cap expanded to 300. - Daily Dungeon hero levels will now randomly vary between levels 1 and 12. Events - The Bingo Event ends on October 31 (KST)! - The Board Event begins on November 1 (KST)! - The Halloween Event begins on November 1 (KST)! Bug Fixes & Improvements - Fixed an issue where the game would close abnormally in certain dungeons. - Fixed an issue where the account level increased abnormally in the level 241 range. - Fixed an issue where Valkyrie’s support mercenary effect was not applied when auto-equipping weapons. - The abilities of Guild Dungeon 1 Boss and Medusa Boss have been reduced. - The item draw limit has been increased to 2000.

Fixed an issue where Stage 851 could not be progressed Fixed an issue where the Cheerful Pirate Shark skin could not attack Corrected the display error in Battlefield of Doom Fixed an issue where Anubis’s Mark was incorrectly displayed on certain units

[Update – October 1] New Hero - Anubis joins the Underdark! - Sweep through dungeons with the ancient hero Anubis! New Pass - 6 new Hero Passes will be added. New Stage - New stages will be added. Event - The Board Game mini-event will end on September 30 (KST). - The Bingo Event will begin on October 1 (KST). Bug Fixes and Improvements - The Apocalypse Battlefield ranking will be reset. - The Apocalypse Battlefield ranking calculation will change from cumulative damage to a point-based system. - Fixed an issue where the Relic of Immunity in Guild Dungeon 1 would not deactivate. - Fixed the shark appearance of the Cheerful Pirate skin. - Fixed an issue where some pets were not being pushed back by heroes.

[Underdark: Defense] - Fixed an issue where the chat function was not working properly. - Fixed an issue where the full immunity debuff in guild dungeons was not deactivated. - Fixed an issue where heroes appeared abnormally while moving on top of the tower. - Fixed an issue where heroes on top of the tower did not receive various buff effects.

[Update Notes – September 1] Bug Fixes and Improvements - Fixed text error for Valkyrie support mercenary. - Added sounds for Valkyrie and the new tower. - The swords around Valkyrie now apply knockback effect to monsters. - Fixed an issue where some character data was lost due to co-op mode.

[Update Details – September 1] New Hero - New hero [Valkyrie] joins Underdark! - Sweep through dungeons with Valkyrie, the hero of the battlefield! New Tower - [Mysterious One-Eyed Portal] has been added! - Use the portal with mysterious power to play strategically! Event Changes - Bingo Event ends on August 31 (KST). - 1st Anniversary Summer Event ends on August 31 (KST). - Board Game Mini-Game starts on September 1 (KST). - Board Game Mini-Game duration extended. Bug Fixes & Improvements - Rocket Tower optimization applied. - Fixed an issue where heroes got stuck on towers and teleported. - Fixed an issue where curses did not trigger in Abyss Hole Dungeon. - Fixed an issue where Jangseung Totem and Paladin critical damage stacking was not applied. - Normal stages expanded up to 850. Character Balance Patch - Siren: Blue Conch Tower crit damage 60% → 120% - Siren: Conch Tower buff range increased - Jolly Pirate: Bomb acquisition 6s → 3s - Jolly Pirate: Hell Barrel chain explosion stacking improved

[Update – August 4] Bug Fixes & Improvements - Buffed the abilities of the Cheerful Pirate and Siren heroes. - Fixed an issue where monster HP increased abnormally on Stage 16. - Fixed an issue where difficulty increased abnormally on Stage 20. - Fixed a missing sound issue for the new Hero, Cheerful Pirate. - Increased the difficulty of the new Dungeon, Dust Mold.

What's New in This Version: * Changed Chain Lightning effect color for Thor's new skin * Increased difficulty of the new map and fixed teleporting monster behavior * Fixed issue where monster HP was hidden behind obstacles * Fixed major performance bug with Pirate hero’s skin (flag placement issue) * Improved UI to fix cropped mounts and heroes in certain views * Barrel Toss skill buffed for Pirate hero and related bugs fixed

[Update – August 1] New Hero: [Goblin Captain of the Deep Sea] New Dungeon: [Dust Mold] Event Changes - Board Event ends on July 31 (KST) - Bingo Event begins on August 1 (KST) Bug Fixes & Improvements - Fixed issue where Hero HP bar was hidden by Monster HP bar. - Fixed abnormal excessive Pet expansions. - Fixed issue where red alerts always appeared on Mounts. - Fixed Hero image being cut off when mounting. - Fixed issue with abnormal display of certain languages. - Fixed 4x Speed Mount not applying to Auto-Hunt. - Fixed nickname change initially applying for only 1 day. - Structure Expansion Tickets have been added. - Structure & Decoration Expansion Buttons have been added.

[Underdark: Defense] July 16 Major Update Notice A new Mount System will be introduced! You can acquire mounts through pet fusion or gacha, and grow them through enhancement and synthesis. In addition, various system improvements will be made, including pet slot expansion and balance adjustments for Mermaid and Salmon Bear. Please check the patch notes after the update for full details.

**Known Issues** * Mushroom Towers are not attacking as intended * Some users are repeatedly receiving a “Please try again later” error message * A meaningless blue visual effect appears around the new hero * The timer image for the “Blue Seashell” item keeps increasing in size * An error message saying “Please report with a screenshot” appears when the game starts

1st Anniversary Event Begins! New Hero: Serene-Eyed Siren New Tower: Unpredictable Cat