Look, we don't update every single time games get majorly reduced on Steam (that would be a little boring) but ladies and gentlemen: Dark Souls. Dark Souls is 75% off on Steam. This is arguably one of the greatest games of the last five years going for $12.48US. You should think about getting on that.
Dark Souls is the star of the show here, clearly, but there are a number of other great deals in Steam's midweek madness sale. Hitman Absolution is $6.24US and Dead Space 2 is $4.99.
So, yeah. Dark Souls. It's an amazing video game and the type of game that new people are playing every day. Getting into Dark Souls should probably be on the bucket list of anyone who enjoys video games. This is as good a time as any.