You can either do this study by yourself or are a part of a group of players.
Press "Begin Study" button when you are ready to start.
When all players are ready, the study will begin. Help solve the Sudoku puzzle collaborately
before the timer at the top runs out. You will see entries made by other players.
You will be notified when time is up. At that time, press the link to return to the waiting room.
Sudoku is a puzzle based on a small number of very simple rules:
Every square has to contain a single number
Only the numbers from 1 through to 9 can be used
Each 3-by-3 box can only contain each number from 1 to 9 once
Each vertical column can only contain each number from 1 to 9 once
Each horizontal row can only contain each number from 1 to 9 once
The puzzle is solved when every square is filled with no duplicates in any 3-by-3 box, row or column