Don't have exact details, but here's a general description that may have it way wrong. Hopefully Kevin can give a more accurate description or post a picture or something:
Giant board on the wall in the cash game room with like 36 squares or something. Each square has a specific hand and cash value, for instance "four of a kind in deuces", or "Royal Flush in Hearts" and a dollar value. If I remember right the values range from like $100 to $1k depending on how hard it is to hit that hand..You win the dollar value shown if you're the first to show down that specific hand. The very last square left on the board wins like $5k or something.
They had it before but discontinued it cause all the hands got made too fast.
Only cash hold'em games qualify obviously.