Generate or solve Sudoku puzzles.
npm install sud --save
var sud = require('sud')
var input_sudoku =
'005070904600508002020000000000080500408000206001090000000000070300104005802030600'
//perhaps the one with least clues having unique solution
var solutions = sud.list(input_sudoku,4)
console.log(JSON.stringify(solutions, null, 4))