# Help Ducky Find Its Way

A simple but very well designed flash game. Unfortunately there is only one level. Read on for a suggestion on how to solve it.

Invariance is a key concept in mathematics. When lots of things are changing, look for those that remains unchanged. So the trick is to find a combination that only moves one square while keeping the remaining ones unchanged.
$\displaystyle$\begin{array}{ll} 3 \; 3 \3 \; 2 \end{array}$$ and $\displaystyle$\begin{array}{ll} 2 \; 2 \2 \; 0 \end{array}$$ will rotate the upper left square once and twice respectively, while keeping the other three invariant. With a little practice, you should be able to solve the puzzle now.

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