Idle Mastermind

Contains adsIn-app purchases
4.6
4.01K reviews
Content rating
Everyone 10+
100K+
Downloads
Content rating
Everyone 10+
Fantasy Violence, Mild Blood, Alcohol Reference, Mild Language
In-Game Purchases
Learn more
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About this game

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.
Updated on
Oct 29, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.6
3.71K reviews
Raiden Lamothe
February 19, 2026
very very fun, amazing, little ads, not p2w, and overall amazing game. however, I do think its 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 "necromerger" its their latest and best project") but I think this game has a little to go, but sadly I dont think it will get those finishes, since grumpy rhino has moved on. atleast we have it right now, still super fun!
2 people found this review helpful
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Emilie Fryer
December 26, 2025
So far really good! I love the art and the charm; you can tell that Grumpy Rhino put a lot of effort into this game. Somewhat similar to Fallout Shelter, but it has its own unique flair and feel to it. The game is a bit slow going, but I'm fine with that and ever time you unlock a new floor or currency or mode, it feels very rewarding. I don't like how that earning the other villains takes absolutely forever and the in-game purchases seem a bit pricy. But other than that, it's a very neat game.
3 people found this review helpful
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travis buttner
March 26, 2024
Fun idle game. Unfortunately progression relies on hard to get materials, and spending them wisely. If you don't you will get to a point where you can no longer progress until you grind those hard to get materials. The green gem things are the most difficult to grind and you need a lot of them or spend money, it's possible to grind them via daily missions but it'll take awhile. Other than that it's fun, silly, and an overall great time killer. Just a little grindy at times.
18 people found this review helpful
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What’s new

+ Technical update.
Content rating
Everyone 10+
Fantasy Violence, Mild Blood, Alcohol Reference, Mild Language
In-Game Purchases
Learn more

App support

About the developer
GRUMPY RHINO GAMES LIMITED
support@grumpyrhino.com
Unit 405 Exmouth House, 3-11 Pine Street LONDON EC1R 0JH United Kingdom
+44 20 7953 2233

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