Upstanding partners in supposed special relationship about to complete puzzle

• Number puzzle
• Place to find numbered cells
• Puzzle based on Latin Squares
• Paper puzzle usually involving a 9x9 grid (2004)
• Digital game?
• Numbers puzzle
• Puzzle with a 9x9 grid, often
• Puzzle French bridge player with fine bluff, essentially
• 9 x 9, 1-9 puzzle

Wiktionary Word definitions in Wiktionary
n. (context games puzzles English) A type of puzzle whose completion requires each of typically nine rows and columns and each of as many usually square subregions to contain, without duplication, 1 up to 9 or the grid dimension.