I've built Sudoku game before, in 2011 (sudokubum.com) and I can tell it it's mostly pure javascript and working/manipulating arrays, not to mention the work needed to be done developing the engine which gives a difficulty rating to the generated boards (easy..difficult), that's a very tricky part. back in 2011 there were no online algorithms to be used and I had to create my own.
Raymond Camden is a Senior Developer Evangelist for Adobe. He works on the Document Services APIs to build powerful (and typically cat-related) PDF demos.
I've built Sudoku game before, in 2011 (sudokubum.com) and I can tell it it's mostly pure javascript and working/manipulating arrays, not to mention the work needed to be done developing the engine which gives a difficulty rating to the generated boards (easy..difficult), that's a very tricky part. back in 2011 there were no online algorithms to be used and I had to create my own.
Took me 3 months to make this game.
I was lucky to find a library that did all that hard work for me. :)