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Slime Castle — Idle TD Game

About this game

The bad humans are invading the mysterious forest! The slime kingdoms in the forest are facing a tremendous crisis!

As a slime chosen by the Slime Sage, you can enhance your abilities through battles, collect legendary equipment, utilize powerful skills, defeat waves of terrifying enemies, and safeguard the peace of the forest.

Once you are defeated, come back stronger!

Slime Castle is a role-playing idle tower defense game.

Players could enjoy an excellent role development system, countless powerful weapons, and several impressive battle scenes.

==== Game Features ====
-Auto-battle system with simple idle clicker gameplay. Enjoy a delightful time!
-Many distinctive maps and different enemies with unique skills. Explore more secrets of this world!.
-Flexible and diverse upgrade system. Build your exclusive fortress!
-Collect mighty equipment and level up the adorable slimes. Experience an extraordinary adventure!
-Abundant free rewards to claim. No need to worry about gold anymore!
-Set battle strategy by combining fortress, equipments, and control enemies. Find the optimal methods to defeat your enemies!

Now let‘s start the epic idle adventure and embark on the path to become the greatest Slime Hero!

Experienced a problem? Got a suggestion? You can reach us at [email protected]

User Reviews

Dustin Hardin
Dustin Hardin
10/11/2025

"Update: They recently changed the mini games to be much more difficult so that they could sell their new mini game passes. I recommend not playing 🙏 Not F2P friendly. Decent fun for outrageous prices. Want a better (or new) character? You need to drop more than $30 for each one. There is only one high-ranking slime available for F2P players. The pull rates for upgrades are incredibly low considering the price they want you to pay."

Matthew Warren
Matthew Warren
9/17/2025

"2 stars instead of one because I do like the game. The problem is the game consists of 90% ads and 10% gameplay. This is one of the worst games I have played in a long time on mobile as far as ads go. edit: I woke up to see your cut and paste response. I played for 25 minutes this morning before having to wake my son up and there were 17 ads........ that's ridiculously absurd. at least give us a paid option to skip ads."

K (Demontoastie)
K (Demontoastie)
1/21/2025

"Edit; Ads work maybe 15% of the time, which is INCREDIBLY frustrating as ads are 99% of how you can progress at a reasonable rate. I've been stuck at the same area for close to 3 months now because ads stopped working and progression is so slow without the boosts. Honestly love this game. While there 'isn't much to do', this type of phone game has a charm a lot have lost. I hope while the game continues to grow and change, it doesn't lose that simplicity."

Dyandrea Phoenix
Dyandrea Phoenix
10/6/2024

"The ads in the game are so frustratingly annoying. There are ads for everything, including increasing the level's speed to 3x. This would be fine if the ads weren't so extremely sensitive that you are almost always guaranteed to accidentally click on the ad, instead of closing it out. And if you do accidentally click on the ad and get taken out of the app, it will restart entirely and you do not receive any of the level goodies, which is more irritating when you are halfway through the level."

Emmanuel Alamo
Emmanuel Alamo
12/5/2025

"love playing the game. it's simple and straight forward. f2p and p2p like every other game. I haven't had any issues really as far as game play goes. only issue I have is the ads that send you to the playstore, everytime they pop up, I already know it's going restart the game and I don't get the reward. those ads need to go. hate being forced into the play store and makes me not want to watch the ads for extra rewards. other then that, I'm digging the game."

4.6
(62,353 ratings)