Microsoft has unveiled the Xbox Live Arcade releases for the month of August as part of its Summer of Arcade.

First up is Geometry Wars Retro Evolved 2, which will hit Xbox Live Arcade tomorrow for 800 Microsoft Points. Geometry Wars Retro Evolved 2 is the latest version of the popular retro shooter and includes six game play modes, new enemies, scoring strategies and 12 diverse achievements.

The mind-bending and artistic puzzle-platformer Braid will arrive on the 6th of August. Developed by Jonathan Blow, Braid enables players to manipulate the flow of time. The remake of the classic NES side-scroller, Bionic Commando: Rearmed will be available on the 13th of August, complete with new graphics as well as co-op and competitive multiplayer modes.

Next up is Galaga Legions on the 20th of August. This remake of the classic arcade shooter features updated graphics and table-turning game dynamics. Last but not least Castle Crashers will arrive on the 27th of August. Featuring hand drawn characters and different weapons, players must defend their kingdom and save the princess in The Behemoth’s arcade adventure.

Enter the Summer of Arcade Sweepstakes by logging in and playing the trial or full version of the Summer Arcade game of the week. You stand a chance to win the grand prize, 100 000 Microsoft Points, an Xbox 360 Elite Console as well as Xbox Live 12 month Gold subscription card. Also up for grabs are two second prize packages consisting of 10 000 Microsoft Points and Xbox Live 12 month Gold subscription card and five weekly prizes of 4 000 Microsoft Points.

Please note that this competition is only open to residents of Canada, France, Germany, UK and US. Head over to the official website for more details.