It may not be as hair-raising as Formula 1, nor as dramatic as Premier League football, but Sudoku solving is acquiring a niche following as a spectator sport.
It's surprisingly thrilling, believe me. Just ask fans of the puzzle-solving YouTube channel Cracking the Cryptic, which has seen its viewing figures shoot up over the last two months. Its top Sudoku video has had more than 3 million views.
In daily challenges, the channel's two British hosts, puzzle wizards Simon Anthony and Mark Goodliffe, narrate their strategies and processes of deduction as they attempt to solve fiendishly difficult Sudokus.
What makes the videos so joyous is the constant stream of 'aha!' moments, as well as the ingenuity of the sudokus presented. The puzzle I am setting today, the Miracle, appeared on the channel last week. (Click here for a printable page for all today's puzzles. To solve them online there is a link underneath each grid.)