Glad you brought up Jacks Open Nino.  It is well worth a mention as a great EM machine with plenty of drop targets.  Hopefully one day someone does a run of new playfields for JO as well.

I miss my Jacks Open, but I know another one will present itself one day. I rate High Hand as good a player, but all card games designed by Ed Krynski are excellent players.

Drop-A-Card is worth a mention, but some don't like the fact that the rules don't allow for all drop target to be reset after knocking them all down. A challenging game.