There is Mr. Maux (or Pono) who keeps publishing unsolvable levels in Chal-4 lasertank official issue.
I can prove that almost all his levels are unsolvable.
Did he submit you .LPB files of the solution?
I doubt.
1.
Let's consider the level 1624 ( Espejito(8) ).
It is obvious that one can reach the flag having TWO bricks to sink them into O11 and O13.
But there is only ONE brick available. Hence, the level is unsolvable.
2.
Let's consider the level 1561 (Homage to Pono 5)
One could reach the flag from N15 or N16, but there is water there.
Even if to kill AT P13, one needs a brick to sink it into O13 and then put some object onto O13, but there is NO bricks in the game! Hence, the level is unsolvable.
Please contradict me if I am not right.
John Baulll