The guess-the-year game, with a timeline

How this guess-the-year game works

In Gazillion, a round shows you a moment and a full timeline from the Big Bang to today. You drag two handles to trap the year the moment happened. The truth falls inside your range or it does not; the width of your range decides how much you score. Then the game tells you the year and a fact.

The single-number version of this game — type “1969” and hope — is a memory test. The range version is a judgement test: you are rewarded for reasoning under uncertainty and punished gently for hedging. A range that is wide enough to contain the answer but narrow enough to be interesting is the whole skill. It is the closest a daily game gets to how historians actually think: with confidence intervals, not certainties. The Gazillion game keeps the same timeline in every round, so the judgement you build transfers from one day to the next.

A strategy that works era by era

Name the era first. The language of the moment almost always tells you the era. Steam engines put you in the modern era; “broadcast” puts you in the twentieth century; “bronze” before the modern era; “irrigation” once you are in the Ancient World. Do not think about years until you have picked a bracket.

Pick the century, then the decade. If the statement describes a technology that only makes sense after a certain invention, the century is fixed. Refine with names, places and political context. A “treaty” in the Middle Ages is very different from a “treaty” in 1919.

Switch to orders of magnitude in deep time. Once you are older than the Stone Age, dates stop being useful and scale takes over. Was that 50,000 years ago, 50 million, or 500 million? The timeline's log scale means a bracket covering “a few tens of millions of years” is a reasonable answer up there, and the game scores it accordingly.

Use the reveal. Every round ends with a fact. Those facts are curated to be memorable, and a surprising number of them reappear as clues later in the season.

Scoring tips: tight, not reckless

Each moment is worth up to 1,000 points; a perfect day is 5,000. The best score comes from the tightest range that still contains the truth. That creates a clear policy: bracket what you actually believe, then zoom in one level. If you think 1955–1965, try 1958–1964. If you have no idea whether a moment is 300,000 or 3 million years old, do not collapse the range to look brave — a wide hit still scores something.

Hints narrow the problem but cost part of the round's maximum, so use them when a specific ambiguity is stopping you, not as a first move. And protect the clock: a locked range always scores something, while a timeout gives you nothing. The final ten seconds should be spent locking in, not second-guessing.

The eight-era cheat sheet

This is the same structure as the timeline in the game. Treat the boundaries as the game's playable brackets rather than strict textbook divisions — they are spaced so each era gets a fair share of the bar.

Practice without losing your streak

The daily is one attempt, but the other modes are unlimited. Use Unlimited to test risky brackets, the Archive to replay published days you missed, and Time Machine to restrict the pool to the eras you keep getting wrong. A few runs of nothing but deep time will do more for your scores than a week of guessing blindly.

When you are ready for the real thing, the full rules are here, and the timeline guide explains how to read the log scale. Then play Gazillion and find out whether your history intuition is as good as your trivia knowledge.