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Very funny game...well, I saw the possibility of the rose after 5 minutes, but stupid me, I didn't put it into practice, I decided to try mathematics first, then I stopped for a quick dinner and when I came back, tried what my intuition told me before, and as usuall, it was right.
So, all in all, it took me about one hour to figure it out, and that's bad. I'm trained to think out of the box, and know very well that emptiness is far better than an analytical mind.
My wife, oh yes...she found the solution in less than 5 minutes.
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