Did You Know?

Competitive Sudoku solvers can hold the full pencil-mark state of a 9×9 grid in working memory, updating it mentally as they go.

Did You Know?
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Champion's Mindset

"I've missed more than 9,000 shots in my career. I've lost almost 300 games. I've failed over and over again in my life. And that is why I succeed." — Michael Jordan

Champion's Mindset