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I had made a similar game, or all math games just look similar : http://mkagenius.github.io/

I just played it. Awesome! Such a simple idea, yet fast and fun. I bookmarked it in my "Interesting" folder :)

I also did something very similar:

It's supposed to be like the "numbers" round from the show Countdown in the UK.

I love that show! Especially the 8 out of 10 cats version.