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Kjell Ericson's puzzle generator

// Use this to convert generated puzzle into query string for this page:
let s = "";
for (let r = 0; r < 9; ++r)
  for (let c = 0; c < 9; ++c) {
    let n = Math.floor(c / 3) * 9 + Math.floor(r / 3) * 27 + c % 3 + (r % 3) * 3;
    s += document.getElementById('id' + (2 + n)).value || '_';
  }
window.open('https://www.schloob.com/sudoku.html?' + s);