unfortunately one of the grids in Version L where the crew push the illuminated blocks has been found with incorrect coding!* Version M fixes the problem by setting the correct coding, but meanwhile for people still playing Version L this is how to win the grid, even with the existing issue* in Version L or previous, after meeting the Skeleton Commander you find a grid with a sign "Outer Edge"  * You notice the whole outer edge is in yellow* now check the edge that contains a closed trapdoor, this edge or row contains a duff floor tile, so avoid pushing blocks onto that entire row to be safe