Weekly Sprint #3 — Hard

• All competitors receive the same puzzle at the same time.
• You must have an email-verified account to enter - register here.
• Rankings are based on: valid completion → highest score → fastest time → fewest hints → fewest mistakes → earliest submission.
• Suspicious completion times are automatically flagged for review.
• Competition window is typically one week.
• Using the Sudoku Solver during the competition is against the rules.

Competition puzzles are typically at Hard to Expert difficulty. To maximise your score:

• Master Hidden Singles - The technique most commonly needed at Hard level
• Learn Obvious Pairs to eliminate candidates quickly
• Practice with the Daily Challenge to build speed under pressure
• Read the full How to Play guide for strategy tips