Three sudokus, one sitting: a six by six, the classic nine by nine, then a variant. Fast and clean earns the black belt.
Shortest first, longest last. Each game pays 15 points for a win down to 1 for finishing, and the circuit adds all 3 up. A game played on its own still counts toward it, but you need all 3 in the same day to take a rank on the circuit board.
The same 3 games every day, with new puzzles in each of them at midnight Eastern.
See all the circuits