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2020-07-19 00:29 dustin  
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originally i wanted to do something in my puzzle book before sleeping, but this is also very nice ;d

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2020-07-19 00:34 dustin  
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there are two slightly different solutions! that's all according to my paperwork ;d

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2020-07-19 09:00 Arno  
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thanks! :-D

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2020-07-20 11:57 nesdori  
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there are 15 different ways to solve this. there are 5 different solvable combinations of drops and the last line can be done in 3 different order for each of them.  
  
so  dustin , in case you need another "before sleep" puzzle try to find all of them but don't spend all the night :)

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2020-07-20 14:57 nesdori  
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oh well; basically there are just two main solutions because the other one has two pairs of similar objects on the last line and by doing all possible combinations of them already achieves 4 combinations of drops. so there are two main combinations and the last row can be done in three different order for both. it's easy to guess that the one which doesn't have object pairs is the intended solution :)

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2020-07-20 21:16 Arno  
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here's my intended solution, indeed without pairs of the same type! :-)

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2020-07-20 21:49 nesdori  
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here is a list of all solutions (p=push, m=move down/up). layers separated by slash and all layers from left to right. the last section is the order of which the last line drops should be done. solutions 1-12 are the non-intended main variation and 13-15 the intended.  Arno 's solution is #15 so it's the most intended sub-variation of the intended main variation :)  
  
1 : P/MP/PPM/PPMP [1, 3, 4, 2]  
2 : P/MP/PPM/PPMP [3, 1, 4, 2]  
3 : P/MP/PPM/PPMP [3, 4, 1, 2]  
4 : P/MP/PPM/MPMP [1, 3, 4, 2]  
5 : P/MP/PPM/MPMP [3, 1, 4, 2]  
6 : P/MP/PPM/MPMP [3, 4, 1, 2]  
7 : P/MP/PPM/PMMP [1, 3, 4, 2]  
8 : P/MP/PPM/PMMP [3, 1, 4, 2]  
9 : P/MP/PPM/PMMP [3, 4, 1, 2]  
10: P/MP/PPM/MMMP [1, 3, 4, 2]  
11: P/MP/PPM/MMMP [3, 1, 4, 2]  
12: P/MP/PPM/MMMP [3, 4, 1, 2]  
  
13: P/MP/MPM/PMMP [2, 3, 4, 1]  
14: P/MP/MPM/PMMP [3, 2, 4, 1]  
15: P/MP/MPM/PMMP [3, 4, 2, 1]

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2020-07-20 22:56 Arno  
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thx for the info! :-D

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2020-07-21 20:13 dustin  
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mine are also #15 and #12 ;d

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2020-07-21 20:17 dustin  
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so my paperwork was right! ;D