Vertigo Games (Sandbox of God) is giving away their bomb-defusing puzzle game Shellblast on Game Giveaway of the Day for the next twenty hours. The $4.95-priced game is currently being updated for a release on Xbox Live Indie Games soon (under the new name Shellblast HD), so it's a perfect opportunity to try the game out regardless of whether you own an Xbox 360 console or not. (source)