Legendarily complicated (and just generally legendary) colony sim Dwarf Fortress launched on Steam a few weeks ago, bringing sprite graphics, more players and millions of dollars for developers Bay 12 games. Brothers Tarn and Zach Adams have spent the past 16 years relying on donations, so actually selling their game has now allowed to expand their team and hire someone from their community to help with the programming. They say "Putnam" will be the first non-Adam to ever see the code behind the curtain. Cue the Indiana Jones face-melting gif.
An update yesterday also added Steam trading cards, as well as giving you the option to flick between classic and premium graphics.