Everyone who enters the same passcode gets the same photos and the same timer. Share one with friends and compare scores.
Each round shows a real photograph. Slide or type the year you think it was taken, from 1900 to today, and submit. The closer your guess, the more points you get: up to 1,000 per photo and 5,000 for a perfect game of five.
Yes. The Daily has five new photos every day, the same for everyone, and resets at midnight your time. Your days played, streak and best score are on the Stats screen.
Unlimited lets you play as many five-photo games as you like. In Settings you can narrow the photos to a range of years.
Everyone who enters the same passcode gets the same photos, so you can play together with friends and compare scores. You can pick how many rounds to play and add a timer, either per photo or for the whole game; those settings travel inside the passcode, so everyone gets the same timer.
Yes, it's free to play in any browser on your phone or computer, and there's also a Chronophoto app for iPhone.