Idle Mastermind has 480 thousand installs. Users love it: 4.6 stars from 3,768 ratings.
Idle Mastermind is made and published by
Grumpy Rhino Games.
AppBrain is an independent app data site and isn't affiliated with Grumpy Rhino Games.
The app name, icon, screenshots and description belong to Grumpy Rhino Games and are shown as
published on Google Play.
About Idle Mastermind
Idle Mastermind is a simulation app developed by Grumpy Rhino Games.
Install Statistics
Idle Mastermind has been installed 480 thousand times. In the last 30 days, the app was installed 760 times.
User Ratings
Idle Mastermind is rated 4.61 out of 5 stars. The rating is based on 3.8 thousand ratings.
App Information
Idle Mastermind is freely available from Google Play. The app size is 93.66 MB. The latest version available is 1.35. The last update was on September 11, 2026.
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 since March 2021.
Description by Grumpy Rhino Games(from Google Play)
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?
No? What, really? Sure you do!
Idle Mastermind, from the makers of Idle Apocalypse, is the best supervillain simulator of 2020! Play as three supervillains. The techy but tiny: Dr DOS. The gangster crime boss: Yara. Or the unpredictable: LOL. Each has their own evil grand plan.
Build a lair to run your empire from. Hire a bunch of evil henchmen to do your bidding. Raid the city above to gain precious resources. Unlock new research and skills to improve your criminal, idle empire.
When you’re ready, execute your evil plan and bring about the apocalypse!
Play as 3 distinct villains, each with: + A unique lair with special floors and henchmen. + Different strategies, skills and stories. + Unique resource management styles.
Build your dream lair: + 30 unique floors. + Floors that will generate resources while offline. + Special floors with unique gameplay elements.
Hire an army of evil thugs: + 20+ henchmen. + Different classes, abilities. + Unique resource management gameplay.
On top of that it has all the humour and inane chatter of a Grumpy Rhino game. The makers of Idle Apocalypse.
Lovers of simulation games and incremental clickers won’t be able to put down this dastardly, near criminal RPG.
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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.
★★★★☆Nep Lyndens· Jul 18, 2025
Excellent idle game, I'm a pretty big fan of the Grumpy Rhino games! Lowered to a 4-star review only because the game seems to be freezing a lot more frequently lately, and it can be fixed by restarting the app, but unfortunately any progress made before the freeze tends to reset itself upon re-opening. Otherwise, very fun to check in on- I love catching conversations, and I appreciate that the ads are not forced on you, and they make it worthwhile to make the choice to watch them.
★★☆☆☆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.
Google Play Rankings for Idle Mastermind
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Technologies used by Idle Mastermind
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