Chrono Trivia is a free daily puzzle game where you arrange four real historical events in chronological order, from earliest to most recent. Every day brings six fresh challenges — one for each category — drawn from a curated database of 943 verified events spanning from the 1400s to today.
Each puzzle gives you four event cards, each with a short title and a clue but no year. Your job is to drag and drop the cards into the correct chronological order. You get three attempts per category. After your first guess, you can unlock a hint that reveals the decade of one misplaced event. When you finish, every event reveals its true year alongside a verified historical fact, so even when you lose you walk away knowing something new.
Two difficulty modes are available. Classic mode asks you to sort events in order. Expert mode asks you to also guess the year each event happened — your answer is counted correct if it falls within two years of the actual date. Expert mode rewards genuine historical knowledge over pattern recognition and earns special badges.
Here is a small selection of real events currently in rotation, one per category, to give a sense of what you'll encounter:
George Lucas's space opera earned $775 million worldwide and launched one of the most successful film franchises ever, transforming Hollywood's approach to summer blockbusters and merchandising.
ARPANET officially adopted the TCP/IP protocol on January 1, 1983, the standard that still underpins every connected device today. Before that switch, networks could not reliably talk to each other.
Bannister ran a mile in 3 minutes 59.4 seconds at Iffley Road in Oxford, breaking a barrier many doctors had said was physically impossible. The record fell again just 46 days later.
James Watson and Francis Crick published the double-helix model of DNA in Nature, building on Rosalind Franklin's X-ray diffraction images. The single-page paper changed biology forever.
East Germany unexpectedly opened its borders on November 9, and crowds began tearing down the wall that had divided Berlin for 28 years, marking a symbolic end to the Cold War in Europe.
Walt Disney's animated short Steamboat Willie introduced Mickey Mouse to the world and pioneered synchronized sound in cartoons, founding what became the most valuable entertainment brand in history.
Chrono Trivia rotates through six themed categories plus a Daily Mix. Each category puzzle uses four events and gives you three attempts. The Daily Mix combines events across all categories into a single six-event puzzle with four attempts — it's the puzzle most people share with friends, since everyone gets the same one each day.
Yes. All players around the world get the same six puzzles each day, and the Daily Mix is identical for everyone. Puzzles reset at midnight in your local time zone, so your friends in other cities may be a few hours ahead or behind you. This is intentional — it keeps competition fair and makes results worth sharing.
Every event in the database is researched and verified against multiple historical sources before being added. We focus on genuinely interesting and educational milestones — first occurrences, surprising connections, forgotten landmarks, and moments that reshaped daily life — and intentionally avoid graphic violence, tragedy, or politically divisive flashpoints. The goal is a game families and classrooms can play together.
No. Chrono Trivia runs entirely in your browser. Your streak, badges, win-rate, and category history are stored locally on your device using your browser's storage. Nothing is sent to a server, no email or password is required, and the game keeps working even when you're offline after the first load.
In Classic mode you don't need to know any years at all — only the order. Even an educated guess based on context clues in the descriptions will often get you a correct answer or close to one. Expert mode is for people who want a tougher challenge: there your year guess only needs to be within two years of the real date.
The current database contains 943 events across all six categories, with new events added regularly. Each event is used once before the cycle repeats, so a daily player will see fresh content for many months. Older puzzles remain available in the archive with full year reveals and historical context for every event.
Any modern browser on phone, tablet, laptop, or desktop. The game is designed mobile-first with large drag handles, generous tap targets, and full keyboard support for accessibility. There's a high-contrast mode and a colourblind-safe option in settings, plus seven supported languages.
Past puzzles, with full answers and the historical context behind every event, live in the Past Puzzles Archive. New to the game? The How to Play guide walks through each step with examples. To learn more about the project, visit the about page.
📚 Browse Past Puzzles & History Explainers →