Criticality Idle - Reactor Sim

Contains adsIn-app purchases
100+
Downloads
Content rating
Everyone
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About this game

Inspired by real simulation tools used by nuclear engineers, Criticality Idle simulates nuclear reactor physics in a fun way that anyone can understand.

Work your way through various reactor layouts, from realistic to silly, and everything in between.

Reactor components include fuel, control rods, water, graphite, reflectors, and neutrons, all of which have multiple upgrades to increase power and income.

Simulator particle limit can be adjusted based on your device capabilities while still maintaining accurate power and income levels.

Early access out now! New reactors to be added weekly!
Updated on
Sep 3, 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.
This app may share these data types with third parties
Location, Personal info and 2 others
This app may collect these data types
Personal info, Financial info and 2 others
Data is encrypted in transit
You can request that data be deleted

What’s new

Galaxy neutron value correction.