This file is indexed.

/usr/games/gnome-sudoku is in gnome-sudoku 1:3.10.2-0ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python3
# -*- coding: utf-8 -*-

# GNOME Sudoku is a simple sudoku generator and player. Sudoku is a
# japanese logic puzzle.
#
# Copyright (c) 2005 Tom Hinkle You may use and distribute this
# software under the terms of the GNU General Public License, version
# 2 or later.

try:
    import bugbuddy
    bugbuddy.install('gnome-sudoku')
except:
    pass

try:
    # Import gnome-sudoku module from source distribution.
    from lib.gnome_sudoku import start_game
except ImportError:
    from gnome_sudoku.gnome_sudoku import start_game

start_game()