u should know how to access as a root---press on this link--- http://www.nokian900applications.com...0-with-rootsh/
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i uninstalled using these codes....---
open x-terminal on your n900\
press these codes below
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sudo gainroot (press enter)* (u should access as a root !!)
cd MyDocs ( make sure M and D are capital) (press enter)*
dpkg --remove --force-all supertux2 supertux2-data (and thats it !!) *