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Last updated on: 2026-06-02
Android Apps > Simulation > Idle Mastermind
Idle Mastermind icon

Idle Mastermind

1.34
Grumpy Rhino Games
4.62
3,717 reviews
100,000+
Downloads
Free

Ever wanted to be the villain? Build a lair? Hire henchmen? Take over the world?

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iOS version

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Idle Mastermind compared with similar apps

Keywords that only this app has

Lair Unique Floors Apocalypse Mastermind Wanted Dastardly Raid Makers Plan Resources Skills Special Resource Management Gameplay

Common keywords of similar apps

Idle Henchmen Build Hire Evil Villain World City Play Empire Criminal

Keywords missing from this app

Tycoon Game Upgrade Games Hell Crime Tap Unlock Recent Ultimate Powerful Expand Simulator Start Underworld Cult Power Business Control Mafia Earn Automate Offline Bitcoin Clicker Villains Make Hero Real Strategic Experience Life Time Superhero Combat Grow Battles Manage Sinners

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About Idle Mastermind

Idle Mastermind is a simulation app developed by Grumpy Rhino Games.

Download Statistics

Idle Mastermind has been downloaded 470 thousand times. In the last 30 days, the app was downloaded 640 times.

User Ratings

Idle Mastermind is rated 4.62 out of 5 stars. The rating is based on 3.7 thousand ratings.

App Information

Idle Mastermind is FREE to download. The APK download size is 88.29 MB. The latest version available is 1.34. The last update was on October 29, 2025.

Technical Requirements

Idle Mastermind requires Android 6.0+ or higher. The app has a content rating of High Maturity. The app has been available on Google Play March 2021.

Description
Ever wanted to be the villain? To build a lair? Hire henchmen? Fight superheroes? Concoct dastardly plans? Raid a city? Or… take over the world?
Show more

More data about Idle Mastermind

Price Free to download
Total downloads 470 thousand
Recent downloads 640
Rating 4.62 based on 3.7 thousand ratings
Ranking Not ranked
Version 1.34
APK size 88.3 MB
Number of libraries 0
Designed for Android 6.0+
Maturity High Maturity
Ads Contains ads

App Performance Report

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Google Play Rating history and histogram

2.8K
620
130
84
62

Downloads over time

Idle Mastermind has been downloaded 470 thousand times. Over the past 30 days, it averaged 21 downloads per day.

Changelog of Idle Mastermind

Show changelog

Developer information for Grumpy Rhino Games

Grumpy Rhino Games

support@grumpyrhino.com

Website

N/A

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Comments on Idle Mastermind for Android

★★★★★ Alex Young · Mar 6, 2025
Really fun Management game, I looked up grumpy rhino games after playing necromancer and idle apocalypse, because I just really liked their style, and I was not disappointed with this one. Really fun idle management game in their classic pixel art style, once you get used to how everything works you won't put it down, check it out. Microtransaction options are actually rather fair and honest, not necessary to progression or enjoyment. The only thing I really recommend buying is the no ads option.
★★★★☆ Raiden Lamothe · Feb 19, 2026
very, very fun, amazing, little ads, not p2w, and overall amazing game. However, I do think it's a little rebirth heavy, and a bit repetitive at times often leading to stand stills. The art style is amazing, and the developers are amazing (I recommend their other game "necromancer" it's their latest and best project") but I think this game has a little to go, but sadly I don't think it will get those finishes, since grumpy rhino has moved on. Atleast we have it right now, still super fun!
★★☆☆☆ Yue Arifureta · Apr 19, 2026
I understand this was supposed to be a fun game, but I find it boring. Even though there are different villains and some features added, I feel that something is missing. All day, I just rotate in the city, and that's kind of boring. I wish something could be different, like a 2D story of a villain attacking the city—something cinematic, with a group of bad guys attacking the city or a single villain. Each cinematic story could have different actions and endings.
★☆☆☆☆ Nareonith · Oct 28, 2025
It's a time waster and a poorly thought out one as well. The "end game" prestige system is just laughable compared to the developer's other games. Boy, it suture is fun starting over from the beginning and redoing everything but SLOWER(like... way slower. 100 times slower).
★★☆☆☆ Darren McCreadie · Sep 6, 2025
I tried this game because I liked their others, but I didn't find this one nearly as fun or engaging, and it has some really unsatisfying game design choices. There is very little to do when you log in, even for an idle. They also lock players out of claiming event rewards if the event ends before you claim them. Absolutely infuriating since you have to spend hard-earned currency to get anywhere in them.
★☆☆☆☆ Joey Kraft · Nov 20, 2024
Game is currently impossible to continue. Need data chips for crafter, but need to upgrade barracks for that but need big guns to upgrade barracks. Impossible to obtain data chips

Google Play Rankings for Idle Mastermind

This app is not ranked

Technologies used by Idle Mastermind

Idle Mastermind is requesting 12 permissions and is using 1 libraries.
Show details
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