screen resolution problem

[subhajit bandyopadhyay]

I installed the extreme tux racer game in Ubuntu 11.10. But my screen
expands abnormally when I start the game.

Here are screen shots

Before starting the game

http://i.imgur.com/3f3pZ.png

After starting the game

http://i.imgur.com/MAS5u.png

Please help me to solve the problem.
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