For me it has been my new Hit the Deck game as well as Neptune. Sweet Hearts and Abra and Diamond Jack still hold my attention.
So close to rolling HtD.
And anybody a fan of Neptunes novelty mode, the same thing (roughly) can be achieved on HtD by moving the 1000 pt chime wire over to the knocker, you get the "knock knock knock knock knock" for the 5K rollovers when enabled. Very fun! Neptune is 50K rollovers but HtD is 5K.