You’ll probably get a lot of messages regarding this, so I guess I’ll leave it as a shout so others refrain from repeating:
The game Duck, think outside the flock is indeed winnable, lvl 25 is a simple game of tic-tac-toe with a not-so-smart computer.
So all you need to do is:
http://www.wikihow.com/Win-at-Tic-Tac-Toe
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