Evil Genius is free right now, and all you have to do is sign up for a Rebellion account to get it.
Rebellion is giving away copies of the 2004 lair-building game on Steam in the lead-up to Evil Genius 2, which is coming later this year. While the original is certainly showing its age by now, it is still without question the best game about being a megalomaniacal mastermind in a Connery-era Bond movie ever made.
Even if you're more of a Moore fan, you should be able to enjoy the bright, saturated colors and comedic spy thriller vibe of Evil Genius. You start by choosing your genius from a selection of archetypal villains, each with their own specialties, then you construct your very first secret lair on a remote tropical island. While you can send henchmen on missions all over the world, the real meat of the game is in constructing the perfect facility to support your nefarious plans and - just as importantly - foil any attempts at infiltration by government agents.
