Level11 (if someone else gets stuck)
Press: 4x(up) [hold left] +spacebar down left, wait till the guard comes to you, once he turns back to go to his position, you go: right 5x(up) 5x(left), now you are in the corner behind the first guard, down down left left left down down down right, you are on the button, [hold down] +spacebar, then without any delay you can go towards the exit: left down down down 5x(right) -mission completed.
Now talking about level13, there is no possibility to write waypoints, because this level is a bit dynamic. Everytime you play it, the gap between three walls changes its position. Three walls make four possible places for the gap, 1 2 3 4 starting from the left wall. Now, it doesn't matter in which position is the First gap, but it is easier to complete the level if the Second gap is in positions 2 or 3. First two guards can be taken out by knocking the wall near the gap, knock, wait and press spacebar. Then you get to the second line of three walls, take two steps between the walls and don't go out untill the guard is walking to the right(if the gap is in position 3) or to the left(position 2), go out and take him down.
By the way, walk near the first line of three walls to look at the radar in which position is the second gap. If it's not in positions 2 or 3, simply press R.
I believe this will help you to complete level13 if you haven't done that while I was writing this post. ;)