70		Battlestations: Midway (Windows, 2007)
60		Guns of Icarus Online (Windows, 2012)
60		Virus: The Game (Windows, 1997)
50		Guns of Icarus (Windows, 2010)
50		Dead Reckoning (Windows, 1997)
40		Thunder Brigade (Windows, 1998)

Notes: Games similar to Project Neptune, Games like Project Neptune, Infogrames Europe SA, Epyx, Inc., DOS, Action, Strategy, Tactics, Shooter, 1st-person, Flight, Aviation, Naval, Watercraft, Aquatic, Underwater, Submarine, PC, Game Similarities.