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# Seven Fun Things You Didn’t Know You Could Do with the Wolfram Demonstrations Project

You already know that Mathematica can do anything technical—modeling, simulation, development, documentation, and so on.

But it’s also a great tool for relaxing. When you need to take a break from your engineering project or math homework, you don’t have to shut down Mathematica. Clear your head with one of these fun activities created by Mathematica users for the Wolfram Demonstrations Project.

Solve a Crossword Puzzle

If you’re like me, you hate to leave a crossword puzzle unfinished. But there’s always that one pesky clue I just can’t get. The Crossword Helper Demonstration lets you plug in the letters you already know and the number of blank letters you still need, so you get a list of words that fit.

Play Sudoku

Based on one of the most popular puzzles in the world, the Sudoku Game Demonstration lets you rack your brain (in a good way!) trying to solve one of these number puzzles in Mathematica. You can even make the puzzle harder or easier, depending upon your skill level.

Find the Disappearing Square

Here’s a brain teaser to occupy your mind for a while. See those five red squares in the middle? Use the slider to adjust the puzzle. Five squares turn to four. Where did the other one go?

24

Take any four numbers. Now use your math skills to create an equation that adds up (or subtracts or divides or…) to 24. Definitely a fun way to test your abilities. And if you get stuck, just plug the numbers into the Krypto, or 24-Game Demonstration for a little help.

Measure the Speed of Light with Marshmallows

Sounds a bit farfetched, eh? It’s all a simple matter of physics. All you need is a microwave oven with no turntable, a ruler, and a handful of yummy marshmallows. But try not to eat any until your experiment is complete.