The official period for "WELCOME 2021 - Sudoku Test" is over. However, you can participate unofficially using this link.
Your timer will start when you click "Start WELCOME 2021 - Sudoku Test" — then you will have 40 minutes to solve and submit your answers.
A timer will be shown the answer page with the remaining time.
If you have any questions or doubts or suggestions, please ask in the forum.