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Each day you're given six historical events. First, drag them into the correct chronological order from earliest to most recent. Once the timeline is solved, guess the hidden theme that connects all six events. It might be a person, place, invention, or idea.

A fresh puzzle is released every day. Come back daily to keep your streak alive, and use the archive to play any puzzles you've missed.

You earn up to three stars per puzzle based on accuracy. The fewer attempts you need to order the events and identify the theme, the more stars you earn. Solving both phases on your first try earns a perfect three-star score.

You earn hints by solving phases correctly, and using them won't lower your score. Save them for when you're truly stuck on a tricky timeline or an elusive theme.

Missing a day will end your current streak, but you can still play that puzzle anytime from the archive. The archive keeps every past puzzle available, so you can catch up or replay whenever you like.

Your stats and streak are stored on your device. If you're not seeing your history on a new device, make sure you're signed in to the same iCloud account, then reach out below if anything still looks off.

ThreadLine runs on iPhone and iPad. It's free to download from the App Store.

ThreadLine is designed with privacy in mind. See the Privacy Policy for full details on what is and isn't collected.