Number Sums

About

Number Sums is a logic-driven math puzzle where players fill grids with numbers to match target sums for each row and column. Every board has a set of clues on its edges indicating the total value each line must add up to. You drag digits from 1 to 9 into empty cells but can only use each number once per puzzle. The challenge lies in balancing competing constraints as grids grow larger and sums more complex. It plays like a numerical version of crosswords but with arithmetic instead of letters. The game’s appeal comes from its steady difficulty curve and lack of guesswork. Puzzles scale from 3x3 grids to 9x9 with no two levels feeling identical. While it doesn’t track global leaderboards, the app saves progress locally so you can return anytime. With over 10,000 puzzles available and daily challenges added, it offers long-term replay value without feeling repetitive. The minimalist design and smooth mobile controls make it easy to play in short bursts but hard to put down once started.