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If you're into binary math games, also see Flippy Bit And The Attack Of The Hexadecimals From Base 16 (note: site has sound).

I'm gonna check this out - thanks.

I also play this one which I think was posted on HN a while ago: https://play.google.com/store/apps/details?id=go.lang.bintri...

Awesome concept, but it looks like the limit is 4 bits. I hope future iterations expand on that (for added challenge, of course).