Google I/O 2021

Every year Google announces the location and dates of its annual developers' conference, I/O, via a puzzle or game. In 2021 the conference was virtual, but the company still produced a "punch card" puzzle for attendees to solve. Over four stages players were shown a series of quotes from famous female programmers and asked to fill in their names. They were then shown full punch cards that had to be punched out according to the clues on the bottom of the page. Once all four cards were filled out correctly, the player then needed to arrange them by color. Finally, the cards could be sorted by columns; sorting them into the correct order would yield the conference dates of May 18–20.