Obsidian Entertainment's espionage RPG Alpha Protocol is now available for pre-purchase through digital games store Steam. To encourage you to throw down money on it right now, Steam is offering another RPG for free.

The freebie in question is Gas Powered Games' Space Siege. It's a sci-fi action RPG that was billed as a spiritual successor to Dungeon Siege. SS and AP are both published by Sega, if you're wondering what the connection between the two games is.

If you pre-purchase Alpha Protocol, you'll be able to download and play Space Siege right away. Perhaps it'll make the wait until AP's October release.