Publisher's description of Tunnel

From Oriol Ferrer Mesia:
You navigate a ship through a never ending tunnel without hitting a wall and you lost. It uses the orientation sensor as controls, making it very direct and intuitive. Your aim is to improve your high score. The tricky part is you don't know your current score is until you lose. There is no current score counter. This wraps the game within a very tense atmosphere, where you can never relax as you are never sure if you did beat your own high score.

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