Delve into Sum Challenge Number Grid, where mental arithmetic meets strategic deduction. Navigate grids of varying complexity, aiming to match targets in every row, column, and region. Uncover the thrill of unique solutions and progressive difficulty, sharpening your logical skills while enjoying a captivating puzzle experience. Sum Challenge, Number Grid, Math Puzzle, Mental Math, Logic Puzzle, Strategy, Cognitive Skills, Brain-bending, Numerical Combinations, Math Game, All Levels, Progressive Difficulty, Rows, Columns, Regions, Target Sum