/usr/share/games/atomix/level/ is in atomix-data 2.14.0-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/games/atomix/level/aceticacid.atomix.xml
/usr/share/games/atomix/level/acetone.atomix.xml
/usr/share/games/atomix/level/butanol.atomix.xml
/usr/share/games/atomix/level/cyclobutane.atomix.xml
/usr/share/games/atomix/level/dimethylether.atomix.xml
/usr/share/games/atomix/level/ethanal.atomix.xml
/usr/share/games/atomix/level/ethane.atomix.xml
/usr/share/games/atomix/level/ethanol.atomix.xml
/usr/share/games/atomix/level/ethylene.atomix.xml
/usr/share/games/atomix/level/glycerin.atomix.xml
/usr/share/games/atomix/level/lactic-acid.atomix.xml
/usr/share/games/atomix/level/methanal.atomix.xml
/usr/share/games/atomix/level/methane.atomix.xml
/usr/share/games/atomix/level/methanol.atomix.xml
/usr/share/games/atomix/level/propanal.atomix.xml
/usr/share/games/atomix/level/propylene.atomix.xml
/usr/share/games/atomix/level/pyran.atomix.xml
/usr/share/games/atomix/level/sequence
/usr/share/games/atomix/level/transbutylen.atomix.xml
/usr/share/games/atomix/level/water.atomix.xml