do I have to move my pen to paint a pixel? is there way to do this without moving?
^doesnt work
edit: while using "flat line ends" option
You could possibly make a one pixel sprite and stamp it-not tried it and not at computer at moment
this doesnt work 
this could actually work. its still easy to increase the size just like pen. size(pensize x 100)
MOVE 0 STEPS with the pen down will put down a single-pixel dot.
oh now I realised.. your solutions working on disabled flat line ends option! maybe not adding the thing in flat line ends was intentional. i dont know. only solution for square drawing is using a costume for now I guess
sorry about that. I updated the question. I need to do this while "flat line ends" option is enabled
To draw square around sprite center
or at right
thats genius! I was thinking about looking at the picture like "filling between 2 points instead of drawing 2 square" but that is way better adapting to situation! Thanks