Online Sudoku

There could be both solo and multiplayer solving. There could be two options for multiplayer solving: 1) Solving one and the same sudoku at the same time, online option (inspired by www.e-sudoku.com) 2) Solving the same sudoku separately, offline option (inspired by www.karu.ee) A rating system could also exist. It could be similar to the current rating system for board games. You shouldn't get a rating for solo solving, otherwise "who-cares-to-talk-more" will start happening. It could be specified that sudokus are solved, not played. Placing Sudoku under leisure games would be a mockery of Sudoku solvers, and Board Games could rather be changed to Mind Games.

I mean, sudoku is a puzzle that you just solve to pass the time, so it would fit under leisure games. Turning board games into mind games doesn't change anything either.