NumSum: Sum Puzzle & Sudoku

Love Sudoku or Killer Sudoku? Try NumSum — eliminate cells so every row, column, and colored region hits its target sum. Offline, ad-free, totally free.

NumSum is the addictive number puzzle that trains your brain in minutes a day.

Cross out the right cells so every row, column, and colored region adds up to its target sum. Easy to learn. Hard to put down.

If you love Sudoku, Killer Sudoku, Sumdoku, or Kakuro — NumSum is your next obsession.

WHY PLAYERS LOVE NUMSUM

• Quick brain training — solve a puzzle in 5 minutes
• Three grid sizes: 5x5, 6x6, and 8x8
• Logic + light arithmetic — no advanced math needed
• Clean, calm, distraction-free design
• 100% offline — play on planes, trains, anywhere
• No ads, no in-app purchases, no sign-up

HOW TO PLAY

1. Each row, column, and colored region shows a target sum.
2. Tap cells to eliminate them.
3. The remaining numbers must add up to the target.
4. Solve every row, column, and region to win.

PERFECT FOR FANS OF Sudoku, Killer Sudoku, Sumdoku, Kakuro, Number Match, Sumplete, Picross, Nonograms, and other logic and math puzzle games.

GOOD FOR YOUR BRAIN NumSum sharpens logical thinking, mental math, focus, and pattern recognition. A few minutes a day is a relaxing way to stay sharp.

THREE DIFFICULTY LEVELS

• 5x5 — warm up, perfect for beginners
• 6x6 — the daily-puzzle sweet spot
• 8x8 — for puzzle masters who want a real challenge

100% FREE. NO ADS. NO TRACKING. NumSum is built by a small team that hates ads as much as you do. There are no banners, no pop-ups, no paywalls. Just puzzles.

Sharpen your mind. One puzzle at a time. Download NumSum and join thousands of puzzle lovers worldwide.