Done.

Done, had to start over

start

ding

done

we get a medium so we can score 8888 today :-)

so of course, we first fill in all the 8's in this diagram

.. and just kept filling in, slow but easy

Again and again, I found I was overthinking it. Looking for something tricky, I always found that the available move was really simple. I didn't even notice a Medium trick. 18.

Done