• Guild Raid • Goblin Camp: 20 stages • Mount catalysts • PvP Season 4 — 2026.10.16 00:00 KST • Improved mount enhancement guarantees, Blue Moon protection, and gauge animations. • Scrollable personal records and increased stage 11–12 rewards. • Improved Guild Raid UI, button touch targets, and click sounds.

• October season with Treasure Hunter, Plague Doctor and Agni, refreshed events, stages 981–1000 and the Calcite ranking tier. • Reworked chat with guild chat, whispers, co-op recruitment, translation, blocking and room sharing. • Added SSS support hero effects at level 20 and improved relic tower Attack bonuses. • Expanded equipment filters, safer awakening controls, Send All Gifts and friend request settings. • Added hero and tower suggestions after repeated stage losses. • Improved daily and weekly rankings, combat performance and interface stability.

Updated the App Store screenshots. Game content remains unchanged from the previous version.

■ New: Item Awakening Awaken God grade equipment up to Awakening 5. · Use items of the same type from Storage as materials — 1, 2, 4, 8 and 16 per stage (31 in total). · Awakening always succeeds, and your item level and bonus options are kept. · The main option grows up to 5× its original value, and each item's unique effect grows stronger at every stage. · An awakened item can only be replaced by one of the same type and grade, and keeps its awakening level. ■ New: Friends · Add up to 30 friends by exact nickname search or from the suggested list. · Send free Diamonds to friends once a day each — the recipient gets 1 to 30 Diamonds. · Gifts can only be claimed on the day they arrive (KST). ■ Friend Roulette Event · Earn 1 roulette ticket every time you claim a diamond gift from a friend. · Spin for Gold, Keys, Diamonds, Embers and more. Spin 10 is supported. · Milestone rewards from 30 up to 300 total spins, including a Legendary Hero, Legendary Tower, God grade item, random Skin and a Unique Mount. · Runs until September 30 (KST). ■ PvP Season 3 — Boss Counterattack Every 5 waves, send one of three bosses to your opponent's side. The chance is shared and does not stack. · Shapeshifter — changes the type of all towers · Destroyer Lord — destroys 4 random towers · Herald of Frenzy — while alive, all monsters move 25% faster New season score rewards and a new season shop are open, and rankings and purchase limits have been reset. ■ Improvements and Bug Fixes · If Co-op Dungeon stops progressing, you are now notified and returned to the lobby. · Chain towers now also link with teammates' towers in Co-op Dungeon. · Co-op room codes now accept codes containing letters and numbers. · Fixed incorrect pricing when buying item boxes in bulk. · Fixed rewards being lost when an error occurred while claiming all mail. · The Medusa map curse now triggers every 2 waves instead of every wave. · Fixed damage numbers not being shown at low FPS.

The September Update is here! - Updated abilities for the featured Heroes, Rabbit and Orc & Boar - Added a new Ranking Tier - Renewed the Season Pass, Growth Missions, and event content - Improved Co-op and PvP battles - Improved combat information displays - Additional bug fixes and stability improvements

3.3.9 Update Notes - PVP Dungeon 2 has been added. - Fixed an issue where clear rewards were not granted when completing another dungeon after playing a PVP Dungeon. - Fixed an issue where the hero joystick did not work in PVP Dungeons. - Improved overall game stability. - Fixed an issue where the Mount Package was not displayed. - Fixed an issue where monsters could not be defeated after Stage 900.

新規イベントを追加しました。 ステージ900以降でモンスターの体力が減少しない問題を修正しました。 乗り物パッケージが正常に表示されない問題を修正しました。

“A Princess and a Knight” Rework - Whenever the Day changes, you can select a weapon for the knight to equip or replace. - Weapons appear in four grades, with each grade having an equal chance to appear. - The weapon selection screen now displays the target hand and its currently equipped weapon. - Skipping a weapon selection now correctly advances the next selection between the left and right hands. [Ability Changes] - Level 3: Whenever the princess or knight defeats an enemy, Final Attack and Critical Damage increase by 5%, stacking up to 2,000%. The current bonus is displayed with a buff icon. - Level 6: Grade 1 and 2 weapons no longer appear; only Grade 3 and 4 weapons appear. Skipping weapon selection grants 1–2 pickaxes. - Level 9: The knight can equip an additional weapon in the right hand, allowing three weapons in total. - Level 12: Each time a weapon is equipped or replaced, the princess and knight gain 20% Attack Speed, stacking up to 500%. The current bonus is displayed with a buff icon. Fixed related issues and improved weapon selection and attack stability.

Version 3.3.5 Update - The August Season has begun! - Featured Hero: Squirrel Thunder - Sub Hero: A Princess and a Knight (Remake) - Improved Squirrel Thunder’s abilities and exclusive buffs. - Adjusted the balance of Orc and Boar and Mysterious Armor. - Normal Stages have been expanded to Stage 970. - Additional bug fixes and stability improvements have been made. Thank you for playing UnderDark: Defense!

This update improves PvP matchmaking and convenience features while addressing several issues. • Improved PvP matchmaking to search a wider score range over time. • The dungeon menu now retains the last selected tab and ranking list position. • Your selected discard rarity is now remembered separately for items, pets, relics, and housing. • Fixed issues with Blink, game speed, mount abilities, and dungeon lists. We will continue improving the game for a more stable experience.

Improved public random matchmaking. If no match is found within 15 seconds, the search will expand to include players from other regions. Improved friend room recovery. If the connection is lost after opening another app, the room will be restored automatically using the same room code. Increased PvP score changes and adjusted how monster HP and movement speed scale over time. Fixed various Co-op and PvP Dungeon issues involving the 10-Ton Weight, Hell Barrel, Chubby Shark’s anchor, Mysterious Cyclopean Portal, and tower information. You can now select how many Hero / Tower Contracts to use when you own 100 or more. Optimized memory usage to reduce crashes during gameplay.

Update Notes - Fixed an issue where rewards might not be granted correctly or the game could become stuck on the results screen when playing normal stages or auto-play-supported content after using PvP mode. - Fixed an issue where acquired items might not appear correctly on the results screen. - Improved overall game stability.

The PvP event is now live! Compete against other players in real-time PvP battles, climb the rankings, and earn score rewards. This update also improves PvP stability, reward display, battle UI, and fixes various gameplay issues.

3.2.9 Update Notice - Fixed multiplayer co-op so equipped heroes, towers, pets, and items now apply their actual levels and bonus options. - Fixed an issue where the loadout shown in the Daily Co-op/Guild Co-op lobby could differ from the actual in-game loadout. - Fixed a text issue where pet drop rate increase effects were shown as item drop rate increases on some screens. We will keep improving the game for a more stable play experience.

- Improved co-op mode stability. - Fixed some display issues. - Fixed other bugs and improved overall stability.

This update includes a major overhaul of the multiplayer co-op experience. We have reworked several co-op systems to improve the overall flow, stability, and long-term foundation of multiplayer play. Because this was a large change, we will continue monitoring reports closely and applying fixes as quickly as possible. We also focused on in-game performance optimization to make battles feel smoother and more stable across more devices. After recent server updates, some players experienced unexpected issues. We sincerely apologize for the inconvenience. We are continuing to review reports and logs carefully to prevent unfair losses and improve the overall service stability.

Version 3.2.6 Update Samurai and Ninja have been improved. Samurai’s [Target the Strong] boss bonus damage now applies as independent bonus damage. The Lv.9 wave-based attack bonus has been increased from 30% to 60%, and Crescent Slash now flies forward and pierces enemies. At Lv.12, Samurai now starts the game with 4 [Target the Strong] cards. Ninja now deals 2x damage to monsters with 20% HP or less. Shuriken hits now apply Shadow Marks, increasing damage taken by marked enemies. The mark limit increases further at Lv.12, allowing much higher bonus damage. Bingo and Board Game events can now run at the same time. You can select and play each event separately from the event screen. Ranking league promotion has also been improved. Promotion steps now vary by rank, and the number of tiers gained is shown when promoted.

Applied recent server/account system fixes. Improved stability.

[Notice] Cloud Save Button Restored Hello, The 'Cloud Save' button that was temporarily disabled has now been fully restored. You can use the Cloud Save feature normally again. We sincerely apologize for any inconvenience and thank you for y

[UnderDark:Defense June Update] - Reaper and Fat Shark heroes are newly revamped. - Reaper’s minion system is improved. - Fat Shark’s iron anchor ability is improved. - Normal stages are expanded up to Stage 940. - The Bingo event begins. - Translation and item box related bugs are fixed. - 1 additional support mercenary ability slot is added.

[UnderDark: Defense] May Update - Balance improvements will be applied to Alien Spaceship and Joker characters. - Alien Spaceship’s Black Hole and Laser abilities will be enhanced. - Joker’s Card Stack and Surprise Box abilities will be improved. - Auto option settings for items, mounts, pets, and relics will be added. - Hero and tower stat calculation details will be improved. - An issue with the oversized unlock icon in the Silkworm Moth Dungeon will be fixed.

[UnderDark: Defense] May Update - A new hero, “Alien Spaceship,” has been added. (Equipped with Laser and Black Hole skills) - The Joker hero has been revamped, improving attack mechanics and growth elements. - Normal stages have been expanded up to 930, with new stages added. - Events have been updated. (Board minigame begins / Bingo and Tower Pass end) - Balance adjustments have been made to boomerang-type items. - Some ranking translation errors have been fixed.

- Se corrigió un problema que mostraba el selector de cuentas de Google en cada inicio de sesión.

[Underdark: Defense] April 11 Update - Guild capacity adjusted to 50 to match server limits and fix UI display issue - Fixed an issue where weekly spending ranking currency changed abnormally - Fixed an issue where Goblin Factory Tower was infinitely duplicated due to Imp Hero effect - Fixed an issue where Sun Ring refresh option did not work properly - Fixed an issue where buffs were skipped when refreshing after watching ads

[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.