The Games for Gold program kicked off the first of two July offers today by making Defense Grid free for all Xbox Live Gold members from now until July 16th. The game usually sells for 800MSP and offers countless hours of fun for new and advanced tower defense enthusiasts. So if you don’t yet have this game, be sure to download it here before that end date!

If you like what you see, then be sure to check out the game add-on section and take a look at what bonus content you can pick up for an even more challenging experience. There’s even a Portal-themed add-on named “You Monster” that will pit your tower defense skills against everybody’s favorite villain, GLaDOS. Be sure to keep an eye on the Games with Gold hub for more info on what game might be free next and check out the Games with Gold FAQ for any questions about the program. Have fun and protect those cores!