Since this is a fun test, we've decided not to have a contest duration. This is to encourage all players to complete the round and get a sense of satisfaction.
Your timer will start when you begin the test and end when you submit all sudokus correctly. Instant Grading is enabled for this test and each incorrect submission will be penalized by 2 minutes. There is no bonus. The score page will be sorted by Submission time, including penalty time, if any.
Hope to see many of you find time to have a crack at this.
Why is my answer wrong even when the rules are satisfied?
Your submitted answer is wrong.
You need to realize that there are 4 Sudokus and they need to be solved simultaneously. You can't solve just one Sudoku independently. Please check the rules again; if anything is not clear, please ask here.