Idle Mastermind – Grumpy Rhino Games LTD
Idle Mastermind – Simulation Game Review Idle Mastermind is a Simulation/Roleplaying game from Grumpy Rhino Games LTD, first launched in 30th March 2021. It’s rated 12+ and currently has 420+ ratings on the App Store. What Makes Idle Mastermind Stand Out Ever wanted to be the villain? To build a lair? Hire henchmen? Fight superheroes?
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