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A flat photo hides most of its clues outside the frame. Here you stand inside a full 360° scene from a documented historical moment, so you can turn round and find them: the skyline behind you, the sign across the street, the harbour at your back. Then you guess the year and the location, and both are scored.
Turn all the way round. The clue you need is often behind you.
Pin the location on the world map, as precisely as you dare.
Set the year from 3000 BC to today. Up to 5,000 points a round.
With a single photo you get one angle and have to guess the rest. A full scene lets you check. If the buildings say southern Europe, you can look for the coastline or the mountains that settle which country. If the street says nineteenth century, you can look for the lamp, the rails or the shopfront that settles which decade.
That is the habit the game trains: form a guess, then go and find the detail that confirms or breaks it.
Each scene is built around one specific, datable event. Moments that cannot be dated with confidence are left out. The reveal draws the line from your pin to the real spot, gives the year, and adds a short sourced note on what happened there.