They start right over the grid. With the slingshots ↳ and ↵ (from which you have also to find the orientation; left or right) the two digits slide through the hole grid.
Normal Sudoku rules apply.
e.g. of slingshots by Stephane Bura
Solution code: row 7 and row 8 (18 digits)
on 15. December 2020, 13:22 by skywalker
Really nice!!
on 15. December 2020, 01:43 by Big Tiger
Made it! Maybe I'm just tired but even after placing the paths of the two digits in question, I just was not scanning well. I gave it a three-star rating for all the trouble it gave me, lol.
on 14. December 2020, 22:39 by Big Tiger
I'm interested, but I'm not quite discerning how the markings in the grid work. I realize I am responsible for which direction the digits go sliding, but (if we picture it as a path), am I turning 90 degrees when IN the cells with the markings?
@Big Tiger
Each marking is the first part of an arrow.
on 14. December 2020, 04:16 by Dina
Really nice and easy, thanks!
on 13. December 2020, 22:23 by stephane.bura
I agree :)
Well done!
on 13. December 2020, 16:22 by marcmees
it could have been a gentle introduction to stephane's slingshot sudoku's.