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Here's a mini-review of Battlestar Reloaded.
It's a browser based game. It's totally free. and I mean TOTALLY free. (at this time, there are no payment options at all, aside from a donation option which gains you nothing). So, that's a plus.
Basically, there are no graphics. It's a game where you set up colonies in a universe alongside other players. a lot of the game is mathematics basically. you want to calculate what you need to build so you can get X.
Yes, there is a pvp option. You can send fleets to attack and loot other players' colonies. Basically, you scout a colony, see what defenses they have set up, send an appropriate attack force, then see what results after your fleet attacks. (there is a travel-time component as well).
One thing I liked about this game above other browser games i've played is this: you can be actively doing stuff for a LOT of your play time. Other similar games have too few options so that you're stuck waiting, or have to log off and come back tomorrow, before you can do stuff again. This game, however, once you start colonizing and whatnot, can keep you occupied for hours on end. You need to start building X on planet Y, you need to scout soandso's defenses. you need to trade dueterium for crystals, etc.
So, a pretty fun game for no-download and no-cost whatsoever.
Currently Playing: Battlestar Reloaded (www.battlestarreloaded.com)
Battlestar Reloaded is browser based and totally free (no options to pay whatsoever). It's a space based browser game where you construct your own space empire while warring and allying with others doing the same.