Every year, CS 50 at Harvard begins with CS 50 Puzzle Day, a campus wide event that draws hundreds of students together to solve a packet of puzzles in teams.

You are cordially invited to participate in CS 50 X Puzzle Day, an online version of that same event open to the entire world.

What you want to do after registering is get together with one or two or three or more classmates or friends, whether or not they're taking or have taken CS 50 x itself and get together either in person or online that download a packet of puzzles and solve as many as them as you can.

You don't need to know any programming or computer science, but you are welcome to use a computer if you like.

Ultimately, though, the event is all about reinforcing the message.

The computer science is not about programming per se, but about problem solving.

And in this packet of puzzles is exactly that.

Ah, whole bunch of problems.

So we hope you will join us for CS 50 X Puzzle day.