SteamWorld Dig, the cute platformer that focuses on mining and going down rather than across like a traditional side scroller, is free for a limited time on Origin. It started out on the Nintendo 3DS eShop before making its way to PC, and we loved it when we played it back in 2013.
It's a solid way to gauge your interest in the sequel that arrives later this month too. Check out the trailer for SteamWorld Dig 2 below, and go here to download the first for free.