If you're thinking of buying Natural Selection 2 in the next few hours, you might want to hold off until 5PM UK time/1PM EDT, as the asymmetrical multiplayer RTS/shooter has been selected, naturally, to get a big fat 50% off Steam sale. For those that prefer to try before you die, there's going to be a nice long free weekend as well, with the weekend having been (seemingly) reclassified to include Thursday and Friday. Hey, I'm not complaining. Head here to reap the rewards, but be sure to check out the following action-heavy trailer before you depart, as Unknown Worlds have made it specially for the occasion. You can tell it's made with love, and not with pure molten hate, because it doesn't feature a single semi-quaver of dubstep.