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How to Solve the second S.U. Doku (sudoku) puzzle

A person solving a Sudoku puzzle on paper with a Sudoku grid displayed next to them.

National and international sudoku champion Thomas Snyder explains how to solve the second S.U. Doku puzzle from Stanford University, along with sharing strategies for starting a sudoku. Get it? S.U. The second video is of him actually solving it.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.

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