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Decay

Also known as Decay, d, decay

Decay is an incremental game in which you are tasked with using your trusty particle launcher to create ever-larger and more unstable atomic nuclei, witnessing longer and more complex atomic decay chains and aiming to discover all the isotopes!

Last update
9 Jun 2026
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v1.1.6Version 1.1.6 Patch Notes

Version 1.1.6 - Patch Notes Changes Removed notifications for second-generation and third-generation fermions as at late game speeds they were causing a significant performance impact. Bugfixes Fixed a frankly bizarre b…

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Latest updates

Update history

Browse past updates and patch notes for this game.

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Gallery

In-game media

Achievements

Community progression

Top picks from 14 Steam achievements, sorted by player unlock rates.

  • The Solar ElementDiscover all Period 1 elements.86.4%
  • The Novel ElementDiscover all Period 2 elements.39.1%
  • The Inert ElementDiscover all Period 3 elements.27.0%
  • The Hidden ElementDiscover all Period 4 elements.20.2%
  • The Strange ElementDiscover all Period 5 elements.12.1%
  • End of InertiaDiscover all Period 3 isotopes.8.1%