They just put them in at Harrington Raceway Casino in Delaware. It's a fun game - definitely improves on the Hold On To Your Hat mechanic. Not too shabby, either - I set it to $0.10 denom and play mostly $5/spin, and I've gotten decent bonuses around $150-250 when they come along. Dover Downs still needs to get them, as well as Ocean Downs near Ocean City. Not sure if they've arrived at the other Maryland casinos yet, since it's been a while since I've gone to MGM, Live, or Horseshoe.