I'm having trouble with the red button for level A.2. The way I think that it should be solved is to:
- Move the upper movement block to two spaces to the left of the ladder in the lower right corner.
- Use the extra downwards movement block in the previous puzzle to be able to get under the block to make it move upwards.
- Push the block by getting on the ladder and move it to the first hole to be able to use the block in the corridor to fill the hole with the red button.
This is blocked because it involves getting to the other side of the upper movement block without moving the block. If the upper movement block is pushed off the place it is on, then you can't move it without blocking the ladder and having it be too far to the right to be able to cause you to push the block up when you walk past the other downwards movement block you get from the previous puzzle (because you can't move downwards if there is a wall in the way).
This leads me to believe that it is currently impossible to get the red button for Level A.2.