Thought this was worth posting considering a large percentage of the cost goes to worthy causes and the price for the game itself works out as £1.36 (160 points) and £2.04 goes to charity (numbers based on the most expensive MS points outlet - direct from xbox.com at £4.25 per 500)
It's a block 'em up puzzle game derivative of Tetris, but without the stress. The levels are soundtracked by Philip Glass, Paul Hartnoll of Orbital, Moby, Markus Schulz and Fred Deakin of Lemon Jelly and there are online leaderboards to upload your high scores against.
Simple to pick up, addictive and in my opinion stands head and shoulders above the guff recently released on XBLA such as last week's KrissX... oh and you get a 50G "Fairy Godmother" achievement just for buying the game
Links to the charity organisations:http://www.onebiggame.org/http://www.savethechildren.org.uk/http://www.starlight.org/