Daily Challenge — same pairs for everyone today

Which Uses More?

Pick the bigger water user. You will be surprised.

10 Rounds per game

8s Per-round timer

00:00 UTC Daily challenge reset

Where the numbers come from

EPA EPA WaterSense

Household fixtures: shower, toilet, faucet, dishwasher, laundry. US averages.

USGS USGS Water Science School

Domestic per-capita use and outdoor watering. US averages.

WFN Water Footprint Network

Agricultural products: coffee, chocolate, avocado, beef, almonds. Global averages, regional variance noted on cards.

Figures are rounded to the nearest liter for legibility; agricultural figures are embedded global averages and vary by region and farming method — the variance note appears on the card when relevant.

Today's 10 pairs are seeded from the UTC date so everyone sees the same set — no server, no account.