Alright I'm gonna be real I don't think it worked for me, I started the game and the snowballs started falling but no matter what I did nothing would happen or interact. I tried hitting all kinds of keys (obviously including typing in numerical sums) and clicked but nothing happened. Given the other comments I assume the game normally works fine.
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Alright fear not, it does work now, you see, I had to toggle one of those stupid proprietary keys on my keyboard for some reason. Yeah I can successfully repel the onslaught of snow with the power of my top-of-the-line, genius math skills........ and by that I mean I still failed almost as fast as when I couldn't type anything, but this time it is definitely a skill issue, lol.