... Perhaps it's the settings and high scores under /var/opt/rovio causing problems?
/var/opt/rovio/angrybirds $ ll drwxrwxrwx 2 root root 304 Jul 29 05:51 . drwxrwxrwx 3 root root 232 Jul 29 05:46 .. -rw-r--r-- 1 user users 3896 Sep 8 14:35 highscores.lua -rw-r--r-- 1 user users 531 Oct 21 14:39 settings.lua /var/opt/rovio/angrybirds $