About SortStack

SortStack is a free daily ordering puzzle. Most daily games ask you the same question every day — here, the dimension changes daily: Monday you might be sorting history, Tuesday prices, then sizes, speeds, populations, weights, and durations. Six real things, four tries, one new puzzle at midnight (your local midnight — the whole world plays the same puzzle on the same date).

Where the numbers come from

Every item is a real thing with a real measured value, curated from public reference sources. Values are approximations — prices shift, populations grow, records fall. We aim for "right order, right ballpark," not decimal precision, and the gaps between items in any puzzle are deliberately large enough that reasonable approximations never change the answer.

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Spotted a value that seems off? The archive shows every puzzle ever published — judge for yourself, then play today's puzzle.