The site Sudoku World has an amusing little feature called “Safe For Work” sudoku. The idea is similar to that of the boss key which was a feature of some old games. The idea was that you could hit a button when your boss came by and look like you were doing something productive when you were really playing a game. The same is true of the Safe For Work Sudoku. It’s disguised to look like a spreadsheet that you’re working on. Now, your boss will never know how many hours you spend playing Sudoku at work.
SudokuWorld.be has also millions of unique, self produced Sudoku’s that all have one unique solution.
word doku?