http://www.pcgamer.com/get-guns-of-icarus-online-for-free-in-the-humble-haunted-halloween-sale/

Steam and GOG aren't the only digital storefront with Halloween sales on the go. The Humble Store has one of its own underway too, and for the first two days it's giving a free copy of the steampunk airship combat game Guns of Icarus Online to anyone who shows up. 

To get it, head to the appropriate Humble Store page, click "Add to Cart," and then make for the checkout. Your order will processed, and a Steam key will be sent your way. But why settle for just the free stuff? There are some candy-sweet deals up for grabs too. As always, a few ideas for your consideration: