This file is indexed.

/usr/share/games/sdl-ball/default/powerups.txt is in sdl-ball-data 1.02-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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//Powerup chance definitions, case sensitive.

Most:
2 //Shrink
F //bigball
G //normalball
H //smallball
P //gun
5 //Multiball
4 //Glue
R //laser sight

More:
1 //Extend
6 //Go thru
B //explosive ball
8 //detonate explosive bricks
A //All bricks have 1 hit left
I //aim
E //Coins
3 //Die

Less:
7 //drop down powerup
9 //Grow explosives
D //Aim helper

Least:
O //Extra life
C //Next level