/usr/share/games/trackballs/levels/sl.set is in trackballs-data 1.2.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | (name (_ "Six Levels"))
(first-level-file "sl1")
(first-level-name (_ "The Desert"))
(desc1 (_ "\"Six Levels\" is, of course,"))
(desc2 (_ "a level set containing six levels. Prepare to scale mountains,"))
(desc3 (_ "kill bosses, roll through the world's longest pipe and"))
(desc4 (_ "much more. Can you beat all the six levels?"))
(desc5 (_ "Made By Ulrik Enstad, ulrik.enstad@gmail.com"))
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