[jbackus]

I hate to be the inevitable nitpicking HN commenter, but this doesn't work in Firefox.

[freditup]

I think these comments are relevant - can be kind of frustrating to try something and wonder if you're just doing something wrong vs. if it is broken.

Unrelatedly, thought it was a pretty well-done and clever game, I'm impressed.

[nowarninglabel]

Also seems to not work with javascript disabled, which is unfortunate given it's supposed to be a CSS demo, I imagine this is just a factor of the particular site though.

[isaacwaller]

It also doesn't work in IE10.

[daledavies]

I cant get it to work at all, in any browser :(

[chenyeric]

it doesn't work in Chrome for me