Microsoft today announced Summer of Arcade, their line-up of arcade titles for this summer. The first title to be released is Geometry Wars: Retro Evolved 2 on July 30th, followed by Braid, Bionic Commando: Rearmed, Galaga Legions and Castle Crashers in the weeks to come. All games will be available worldwide, with the exception of Bionic Commando Rearmed, which will not be available in Korea. On top of that, if you play the trial or full version of the Summer of Arcade game of the week, you can enter the sweepstakes for a 100,000 Microsoft Points Grand Prize. Check the press release for details.