I Am The Boss Monster

I Am The Boss Monster

Defend your castle as the boss

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Released
November 4, 2026
Updated
November 5, 2026

Features

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About

I got hit by a truck... and woke up as the boss slime of a Demon Castle. One gamer too many. Goddess Serena made a mistake and the hero quota was already full, so the only seat left was on the Demon Lord side. Now you must hold back the invading heroes, grow your castle, evolve again and again, and become the Archfiend. That is the only way back to your own world. I Am The Boss Monster is a defense RPG where you are the boss who guards the Demon Castle. ■ Design your Demon Castle - Place minion monsters, traps and turrets on every floor. - Block paths with walls to lure heroes into your traps, and lay floor patterns for extra effects. - Pick a formation for each floor, such as Wedge or Crane Wing, and set rules that switch formations mid-battle. - Not sure where to start? Tap [Auto] for a recommended layout. - As your castle levels up, your castle gains more floors. ■ Stop the hero parties - 45 heroes, from rookie warriors to paladins, witches, elf marksmen and inquisitors, climb your castle with their own skills. - They rise floor by floor through stair portals. Stop them with minions and traps. - Speed up battles at 2x or 4x. ■ Take control of your boss - On the top floor, the Throne Room, you move your boss with a joystick. - Crush heroes with a basic attack, two skills, and an ultimate powered by Rage. - As your HP drops, your boss enters new phases and awakens new abilities. - Busy? Turn on [Auto] and let your boss fight with the strategy you set. ■ 6 bosses to evolve into - Start as the Boss Slime and evolve into the Lich, Demon Dragon, Vampire Lord, Bone Dragon and Archdemon Hanes. - New bosses unlock as your castle levels up, and you can change your boss in the lobby at any time. - Every boss has its own skills, phases and fighting style. ■ Grow your boss on a Constellation - Earn a Star Shard every time your Starlight level rises. - Spend Star Shards on each boss's own constellation to power up skills, and choose skill variants at the forks. - Turn on auto-assign and stars light up on their own as your Starlight grows. ■ Over 100 minion monsters - Summon 108 monsters from four legions at the Summoning Altar: Beast, Necro, Demon and Giant. - From cute slimes to skeleton knights, the Hellgate Warden, frost giants and the Bone Dragon. - Group minions of the same legion to trigger legion traits, and use the matchups between legions. - Train minions with enhancement stones, and equip your boss and minions with gear for 13 slots. - Collect the illustrations of every monster and hero you meet in the Codex. ■ Raid other castles - Choose your boss and minions and storm another Demon Lord's castle. - The fewer minions you bring, the bigger the reward, and minions you bring are never lost. - Set a separate [Away] layout to guard against raids from other Demon Lords. ■ Demon Unions and Union Wars - Sign in with Google to create or join a Demon Union. - Chat with your union and fight Union Wars against other unions to assault their castles. - Pick a target on the attack map and check your allies' assault records. ■ The Arena - Real-time 1v1 duels between Demon Lords, bosses only. You are matched with players of a similar level. - Make a room for a friendly match with a friend, or practice against an AI Demon Lord. - A 3-minute fight while poison fog closes in. - There is also a 4-player free-for-all against AI Demon Lords. ■ And more - Daily quests, attendance rewards and the Shooting Star Black Market - A lobby that changes with your castle level, boss monologues and tips from your assistant Hornbit - Background music that changes with your boss and the situation - Link your Google account to continue on another device - Korean and English It all started with a goddess's mistake. Now you are the boss. Contact: help@pinkmandarin.com
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What's New in I Am The Boss Monster

0.4.7

November 5, 2026

- The floor, characters, traps, walls and effects are now drawn with a tilted perspective, so your castle looks more three-dimensional. - The layout screen now has the same lighting and shadows as battles. - Save and load layouts (3 slots) and reset layouts (all, minions, traps or walls). - Fixed heroes circling a trap so battles never ended, and minions in Square formation standing still. - All 9 slimes have new art. - The stage 5 boss is now called the Archdemon, and the monster that shared the name is now the Six-Winged Fiend. - Each boss now has its own lines in the lobby. - Trap and wall upgrades now show that they apply to every placed one. - You'll be asked to update at launch when a new version is out.

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Subscriptions & In-App Purchases

$0.49

3,000 Gold

Fills your castle vault with 3,000 gold.

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