It took 3 days to get thru level 917. 4 days now on level 923 with no end in site. At some point, algorithms will eventually let me sail on thru with no hint as to what actions allowed to me finish the level. Along the way, those "Excellent!" exclamations will pop-up but will have been pointles as they will have been of no help in reaching the goal. I even resorted to a Google search for a You-tube tutorial but alas! there is none. So... no one has ever conquered Level 923.