No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. Reviews and prices only.

Middle-earth™: Shadow of War™

Go behind enemy lines to forge your army, conquer Fortresses and dominate Mordor from within. Experience how the award winning Nemesis System creates unique personal stories with every enemy and follower, and confront the full power of the Dark Lord Sauron and his Ringwraiths in this epic new story of Middle-earth. In Middle-earth™: Shadow of War™, nothing will be forgotten. Please note that the multiplayer mode is not supported.