Idle Mastermind v1.34

Grumpy Rhino Games

Contains ads • In-app purchases

About this app

Developer Description

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

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.

What's New

+ Technical update.

In-app purchases

$4.99 - $99.99 per item

Version Information

Version: 1.34
Downloads: 100K+
Updated on: Oct 29, 2025
Released: Mar 26, 2021
Requires: Android 7.0

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Idle Mastermind users say on Google Play

★★★★★

Robert Griffin

Honestly, this company is my favorite game company. They aren't overdone and dry like most game companies. Ads are pretty sparse, usually tied to keeping timers going for bonuses and daily bonus items. One of their games, I've played daily every day for 3 plus years. They do have things to purchase, but it's not necessary, you can get most of it without. I wish more game companies had games this simple and fun to play.

★★★★

Chris Garner

It's a fun idle game with a lot going on Paying to removing ads and getting the trio of permanent buffs is my standard practice for Grumpy Rhino games since that's the closest I can get to feeling like I'm getting a full game and supporting the devs. There is still a lingering worry that not purchasing premium currency could eventually lead to progress stalling out. It'd also be nice if removing ads tweaked the UI to remove mention of them, though that's admittedly a small subjective issue.

★★★

Blackholelord

I liked it and played a long time, but when you realize there is no true ending, but the repeating of the same thing it became more of a chore than actual fun.

★★

Richard Shingleton

make your game more playable and less payable. Maybe then it would succeed.

★

Nareonith

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 suuurre is fun starting over from the beginning and redoing everything but SLOWER(like... way slower. 100 times slower).