You can run it in non-asm.js browsers; the released version of Firefox can run it, for example. It doesn't crash, but it is slower. According to the FAQ on the

You can run it in non-asm.js browsers; the released version of Firefox can run it, for example. It doesn't crash, but it is slower. According to the FAQ on the game site [0], Chrome has a bug which is expected to be fixed soon. [0] http://www.unrealengine.com/html5_faq/ http://www.unrealengine.com/html5_faq/