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Yes, the ports use emscripten to convert to JavaScript/asm.js.

Do you know how much overhead it introduce? I'm curious.

Unity just launched a benchmark that can help answer that,

http://blogs.unity3d.com/2014/10/07/benchmarking-unity-perfo...

It does run somewhat slower in a browser compared to native, but the difference is really not very big.

To put it another way, the differences between browsers are about the same size as the difference between the fastest browser and native. So it's in the right ballpark.

Programs might run a third as fast, but most of these games are not so taxing as to even use a third of a modern computer's resources. So they work fine in the browser.

Did you try the Voxatron one?

Yep, although my computer is fairly advanced, so maybe that would not work so well on a slow computer.

Have you tried BananaBread¹?

1: https://developer.mozilla.org/en-US/demos/detail/bananabread

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