Super Stacker 2 - Wont Advance to Level 24

[mrlewp87]

Im here because I didnt see any contact links within the game. Im in the "Tricky" levels, and have completed No. 23 multiple times. The No. 24 is hi-lited as it should be, meaning it can be selected to play. But each time i try, the "failed" message appears? The No. 23 has the green checkmark as it should, meaning completed. Ive returned to and completed 23 several times, with the same results, success on 23, but a failure message when trying to start no. 24. Also, a very odd msg. when this happens; "what am I missing?" !!?? YES, what AM I missing here?