/usr/share/games/trackballs/levels/bx.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 | (name (_ "Box-O'-Fun"))
(first-level-file "bx1")
(first-level-name (_ "Box of Fun"))
(desc1 (_ "This is a set of three quite large levels created by Warren D. Ober."))
(desc2 (_ "Here you will find some interesting use of pipes and other objects."))
(desc3 (_ "Hint: If you have difficult entering a pipe try to jump a little."))
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