How ReceiptDuel estimates and scores
ReceiptDuel uses handcrafted baskets built around familiar shopping scenarios. Each round contains fixed item totals chosen to feel plausible within the stated context, such as a discount supermarket, train-station café, or open-late convenience store.
Pack design principles
- Every pack has four rounds with a clear emotional arc: light confidence, creeping doubt, pressure, then a final ambush.
- Items are everyday and legible. The challenge should come from price memory and calibration, not from obscure products.
- Context clues such as “station premium” or “checkout bait” help players reason about why a total feels higher or lower.
How the score works
After each guess, ReceiptDuel calculates the absolute miss in euro and the percentage error versus the actual total. The round score starts high and drops as the miss grows. This makes small precise guesses feel meaningfully better than broad lucky guesses.
- Perfect read: percentage error up to 3%.
- Sharp read: percentage error above 3% and up to 8%.
- Still alive: percentage error above 8% and up to 16%.
- Receipt shock: percentage error above 16%.
How streaks work
Only the two strongest verdicts — Perfect read and Sharp read — extend the streak. This keeps streaks meaningful and prevents very loose guesses from feeling the same as disciplined ones.
Boundaries and limitations
ReceiptDuel is not a live consumer-price database. It does not scrape stores, track taxes by municipality, or represent all regions equally. The point is a playable, believable estimation challenge that captures the emotional truth of price memory rather than a formal economics tool.