Sorry for the late reply. Ah, I see. I will make a solution in the form of a video. But for now, I just provide the hints for 3-9 and 3-10.
Hints for 3-9
Hint 1: Gb fbyir cerivbhf yriryf zvtug or urycshy (rfcrpvnyyl, guerr-frira)
Hint 2: Goal looks like https://imgur.com/nS1X2zC
Hint 3: Midway looks like https://imgur.com/a/EKTsCzn
Hints for 3-10
Hint 1: Jung vf gur qvssrerapr orgjrra guerr-avar naq guerr-gra?
Hint 2: Jung unccraf, vs n checyr oybpx chfurf n checyr ohggba?
Hint 3: Goal looks like https://imgur.com/nIa0i8i
Hint 4: Midway looks like https://imgur.com/77DAxYn