The game’s creator, Tom Watson, describes it as’Wikidata as a trivia card game’. The Tweet that brought it to our attention calls it an’online clone of the card game timeline’.

You’re allowed three mistakes, which are represented by hearts, and you’ll lose one if you put a card in the wrong place. Losing all your hearts will end your streak and force you to restart with a new timeline.

I promise that last one was a slip of the mouse’s mouse. The mouse slip was a bit of the rodent.

The action of moving cards onto the timeline actually works almost flawlessly on my phone. I got at least one that had a year in the title, making it pretty easy to place.

Watson does have a thread started on GitHub where people can report incorrect cards or data. There’s also the possibility of data being wrong.

The page calls on users to make any necessary corrections to Wikipedia or Wikidata itself. The page also calls for user to make errors that could end up being reflected there unless they’re fixed.