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Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can ...

Explore daily insights on the USA TODAY crossword puzzle by . Uncover expert takes and answers in our crossword blog.

Are you also playing NYT Strands? See hints and answers for today's Strands. If you're looking for more puzzles, Mashable's got games now! Check out our games hub for Mahjong, Sudoku, free crossword, ...

C-Doku is a command-line Sudoku game written in C, featuring an interactive grid, difficulty levels, a leaderboard, and an SQLite-based scoring system. Players can solve randomly generated Sudoku ...

Rather than dig up fossils of bones, the scientists of the future will likely puzzle over technofossils ... which are chemical building blocks of life. The samples do not contain conclusive ...