/usr/games/ninix is in ninix-aya 5.0.4-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
export LD_LIBRARY_PATH=/usr/lib/games/kawari8:/usr/lib/games/yaya:/usr/lib/games/ninix-aya:${LD_LIBRARY_PATH}
exec ruby /usr/lib/games/ninix-aya/ninix_main.rb ${1+"$@"}
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