This contest is part of 2021 World Sudoku + Puzzle Convention. Details here.
Remember to fill in the registration form before you take part in the WS+PC
The official period for "07 - 20 by 20" is over. However, you can participate unofficially using this link.
Your timer will start when you click "Start 07 - 20 by 20" — then you will have 60 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.
New users must register here (free) to be able to participate.