Welcome to SIMMER 2.0!

We just rewrote the entire site and relaunched on Feb 15, 2025.

Need the old site? https://legacy.simmer.io

Need help? Got feedback or found a bug? support@simmer.io, discord

-Rocco, simmer.io founder
Diego Wechselberg
viruXpand
One of these days a Covid-19 particle has entered your system. However it hasn't fully grown. So now it's up to you to take care of yourself not to get sick. Don't let it combine with other virus.

You only need a mouse. Tutorial is in-game. Have fun and leave some feedback.
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