Sudoku is a popular pencil and paper game that you typically play solo, just like doing a crossword puzzle. You can play a head-to-head version in Poptropica Common Rooms. Sudoku takes a lot longer to play than the other games.
The objective of the game is to complete the puzzle grid by placing the numbers 1 through 9 in each of the squares. The rules are pretty simple. Each row must have the numbers 1 through 9 in it exactly one time each. Each column on the board must also have the numbers 1 through 9 in it. Finally, each individual 9-square grid must also have the numbers 1 through 9. Based on this, you can deduce how to fill each empty square. Sometimes you can narrow things down to one or two options and you just need to guess.
In the Poptropica version, you can play against an opponent so it’s a race to see who can score the most points. The player who solves the most squares and therefore gets the most points wins the game. Unlike most of the other games, Sudoku keeps a running total of your wins and losses so you can see how good a player is when you start the game.