CrossSum: Puzzle Game

CrossSum — the addictive number puzzle that's easy to learn and hard to put down.

Every grid gives you a set of numbers and a target sum for each row and column. Your job: circle the numbers you need to keep, and erase the ones you don't, until every row and column adds up exactly right. No two puzzles play the same, and every level is generated fresh with a single, logical solution — pure deduction, zero guesswork.

HOW TO PLAY • Tap a number to circle it — that means you're keeping it in your sum. • Switch to Erase mode and tap the numbers that don't belong. • Match every row and column target to clear the level. • Make a mistake and you'll lose a heart — run out, and it's back to the start of the level.

WHY YOU'LL LOVE IT • Quick to learn, genuinely tricky to master — a built-in tutorial gets you playing in seconds. • Bite-sized levels that are perfect for a coffee break or a long commute. • Difficulty ramps naturally from simple 3x3 grids to challenging 6x6 puzzles as you progress. • Clean, distraction-free design with satisfying taps, haptics, and a confetti celebration when you solve a tough one. • Stuck? Use a hint to reveal one correct move and keep your streak alive. • Your progress is always saved — pick up exactly where you left off.

CrossSum is built for anyone who loves a good number puzzle: fans of Sudoku, Kakuro, and logic games will feel right at home, and newcomers will be solving puzzles within their first minute.

Play a level whenever you have a spare moment, or settle in and chase a personal best. Either way, CrossSum is the kind of puzzle game that turns "just one more level" into your new favorite habit.

Download CrossSum now and start circling your way to sharper thinking, one grid at a time.