The new Humble Weekly Sale is a good one, as this week it stars four games from Puppy Games. Ultratron, Droid Assault, Revenge of the Titans, and Titans Attack are all available on a pay what you want basis. Pay over the average and you'll get Steam codes for them all, which is well worth doing because they're colourful and frantic shooters (well, the ones that we've played from the line-up certainly are). Head this way to find out more.