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All Positech Strategy/Sim games by Positech are on sale for 50% off at Direct2Drive this weekend. A game of interest is Gratuitous Space Battles. It’s described as a hybrid RTS/Tower Defense game.
It’s $11.47 ($22.95) at the US D2D site and £6.97 (£13.95) at the Direct2Drive UK.
Note the 10% off promo coupons and the 15% off codes aren’t working on this game.
This game has a 72/100 metascore. The expansion DLCs for the game are 50% off too.
I’m about to post a few 20% off one-time use codes that will work on the game however, if you want to try to grab one of those.