PastGuess turns archival photographs into a daily guessing game

Field notes

The game combines a world map, a timeline running from 1850 to today, and five shared daily photographs. Its scoring splits each 10,000-point round evenly between place and year, with distance and date errors declining smoothly rather than producing an all-or-nothing result. The page also describes a 5 km location tolerance and says the answer data remains server-side until submission.