If you press ESC and then close game and type `edit` there is a variable called `hold_to_move` you can change from true to false. Then either click the play symbol in the top right or press CTRL+R to run the game. I've been meaning to add a settings menu to this for years but never got around to it 😅
Won a game! Ok, now it’s by far more user-friendly and doesn’t take too much effort and distraction :) I guess the difficulty level is a bit inconsistent - Middle starts way too easy, but the previous attempt was above my Sudoku skills to finish (the dependencies got too convoluted to solve without “trying one direction” but as ctrl+z here goes back only one step, returning to the original position would be problematic). Next puzzle was almost trivial, however, I’m not sure if I did some mistake or is there no win notification for finishing the puzzle?