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The world of science news never sleeps, but even we need to take a break every now and then. And what better way than to give our collective brains a good workout with sudoku?
The rules are simple: Each row, column and 3 x 3 box must contain the numbers 1 to 9, with no repeats. Sounds simple, right? Sometimes it is; other times, it's a little more challenging. (That's when tapping the hints button comes in handy.) Regardless, it's a great way to step back for a bit and crunch some numbers.
We have three new sudoku puzzles of varying difficulties every day — easy, medium and hard — so be sure to bookmark this page and try a new challenge. Enjoy!
Easy, 36-45 clues
Medium, 28-35 clues
Hard, 17-27 clues
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It's time to put your gray matter to the test with our weekly, free science crossword puzzle — updated every Monday.
Try a science quiz and see how well you score against other Live Science readers.