MahJongg Dimensions is a 3-D twist on the classic Chinese tile game. Your goal is to clear a stack of tiles by removing matching sets. Each tile must be clear of other tiles on at least two sides. You can rotate the stack using the arrow keys on your keyboard or by clicking on the arrows on the game board. MahJongg Dimensions is timed, and you're racing the clock to clear three increasingly-difficult rounds before time runs out (and this is really challenging to do!)
Today only, playing is not only fun, but could also be profitable. The person with the highest score on January 20, 2010 will receive $1,000. The second-place winner will receive $500, while the third-place winner will take home about $250. 25 runners-up will receive 1,000 bonus points, and everyone who plays will receive 10x bonus points. These bonus points can be traded in for sweepstakes entries.
Read the Official Tournament Rules for more details. You must be a registered PCH Games user to be eligible to win (I've been registered for quite a while now, and have never received spam or unwanted marketing mails from them). The tournament runs from midnight to 11:59 PM on January 20, 2010.