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Guides
Each guide starts from something we measured on our own sheets or checked against an official source, and says where every number comes from. They are few on purpose.
How to print at actual size, and check it with a rulerOur own graph paper printed at 88% of true size. Why it happens and the ruler test that catches it.2027 federal holidays: the days off, and the Fridays banks stay openFour weekday swaps in 2027, and on three of the Fridays off the Federal Reserve Banks stay open.What makes a sudoku hard? We tested 500 puzzles by clue count18% of our 24-clue sudoku need nothing but the two simplest techniques. Clue count is not difficulty.What makes a good maze? One route, loops and dead ends, measuredWe measured 1,000 of our own mazes: loops, dead ends and route length at every level.