Criticality

One neutron does nothing on its own. In Criticality that single fact is the entire game: tap to fire it into a field of waiting atoms, and what happens next is either a fizzle or a cascade big enough to make the whole screen shudder.

The Atom-Splitting Loop at the Center of Criticality

The rule Criticality builds everything around is deliberately simple: an atom that absorbs a neutron splits and emits two more neutrons of its own. Fire one neutron into a dense enough cluster and those two neutrons can each trigger their own splits, which trigger more splits, and so on until a single tap has set off a chain reaction that dwarfs whatever you originally aimed at.

That escalation is the entire appeal. Early on, chains fizzle out after two or three splits and feel almost unremarkable. Once you understand how positioning and density affect the spread, watching a modest tap snowball into a screen-filling cascade becomes the moment new players describe as the point the game actually clicks.

Criticality’s Upgrades Supercharge the Reactor, Not Just the Numbers

Points earned from successful chains feed directly into a growing set of upgrades, and the framing matters here: you’re not just buying bigger numbers, you’re supercharging a reactor that visibly behaves differently as you invest in it. Denser atom fields, longer chain potential, and eventually stranger additions to the board all change how a single tap plays out.

• Early upgrades increase atom density, making small chains more reliable.
• Mid-tier upgrades extend how far a single split can propagate.
• Later upgrades introduce black holes that interact with chains in their own unpredictable way.

The black hole additions in particular tend to divide players. Some treat them as the game’s most satisfying late addition, since they warp how a chain reaction spreads instead of just making it bigger. Others find them visually chaotic to the point of making it hard to read what’s actually happening on screen during a big cascade.

A Screen That Visibly Reacts to How Far You Push It

Criticality has one specific touch that players bring up again and again: the screen itself starts to wobble as criticality climbs during a big chain. It’s a small effect, but it turns an otherwise numbers-driven incremental game into something with real physical feedback, making an enormous chain feel like it’s straining against the edges of the screen rather than just ticking a counter upward.

That wobble is doing real communicative work. Without a health bar or fail state to react to, it’s one of the only signals the game gives you that a chain has gotten genuinely large, and long-time players use the intensity of the shake as an informal gauge of how good a given run is going.

Do you need to understand nuclear physics to play Criticality?

No. The neutron-and-atom framing is just flavor for a chain-reaction mechanic; the game never asks for real-world physics knowledge, only pattern recognition about density and spread.

What causes a chain reaction to end early in Criticality?

Running out of nearby atoms to absorb a neutron ends a chain, which is why density upgrades matter so much for building longer cascades over time.

Are the black hole upgrades worth prioritizing?

They reshape how chains propagate rather than simply scaling damage, so players chasing the biggest possible single cascade tend to value them highly despite the added visual chaos.

Whether you came to Criticality for a quick incremental fix or stayed for the reactor-management layer buried underneath, the game’s real hook is that single neutron tap and the uncertainty of not knowing, until the screen starts shaking, just how far this one is going to go.