The record for being the youngest kid to solve 6 x 6 Sudoku puzzles was set by M. Kiruthanya Shree (born on May 11, 2015) of Chennai, Tamil Nadu. She solved three 6 x 6 Sudoku puzzles in 10 minutes and 15 seconds at the young age of 5 years, 5 months and 7 days, as confirmed on October 21, 2020.