Link (browser game): http://np.ironhelmet.com/

Neptune's Pride is a multiplayer game of Strategy, Intrigue and Galactic Conquest.

The game is real-time and played over several weeks. You can log in at any time of the day to check the progress of your fleets, view the results of battles and issue new orders.

It's the game you know and love with a twist. A 4x (explore, expand, exploit, exterminate) Strategy game with its complexity stripped away to reveal an exciting game of diplomacy and strategic command. You check in once or twice a day, move your ships, upgrade your stars, then let the galactic war play out over hours and days.

"Five weeks of plotting, bluffing and double-crossing with Neptune's Pride, the most duplicitous strategy game of the year." - PC Gamer

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Well, I don't know how to describe this game other than 'epic, long, epic'.
You conquer stars, make alliances, break alliances, again conquer stars, again make and break alliances. It's game that you have betray everyone if there is occasion to make a good move for yourself.
My experience with it just started. I've made an account and joined first game I saw. Right now I've just raised my economy and sent fleets to get stars near my home system. I've just started a long story that I want to end with sentence "I won.". How it will be? Well, I will give infos every time something cool happens.

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I've found this game by accident. Browsing internet stuff I've come on a blog - well, it's more like a story of 8 people playing a match. It last for month. I really advise you to read it, because it's cool. Alot of twists.

"The One Month War for Neptune's Pride: Part 1-7"

http://www.computerandvideogames.com...-pride-part-1/
http://www.computerandvideogames.com...-pride-part-2/
http://www.computerandvideogames.com...-pride-part-3/
http://www.computerandvideogames.com...-pride-part-4/
http://www.computerandvideogames.com...-pride-part-5/
http://www.computerandvideogames.com...-pride-part-6/
http://www.computerandvideogames.com...-pride-part-7/

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some screens: