ZenSum: Number Puzzle

ZenSum is a number puzzle built on one simple idea: switch on the right cells so every row and every column adds up to its target.

No arithmetic drills, no guessing. Every puzzle has exactly one solution, and it can always be reached by pure logic.

HOW TO PLAY
• Each row and column shows a target sum.
• Tap a cell to switch it on, hold it to cross it out.
• The small number beside the target tells you how much is missing (−) or over (+).
• Solve it in as few moves as the solution needs and the stars are yours.

WHY IT FEELS GOOD
• You can't get stuck. Wrong moves are corrected for you, so a puzzle never dies in a knot of your own mistakes.
• You learn it in seconds. The tutorial shows, it doesn't lecture.
• Nothing counts down. The clock only decides your speed bonus — take a minute or take ten.

WHAT'S INSIDE
• Campaign — levels that start at 4×4 and grow, with three stars to chase on each.
• Daily challenge — the same puzzle for every player, every day. Keep your streak and share your score.
• Free play — pick the grid size and difficulty you're in the mood for.
• 18 colour themes, 14 of them unlocked simply by playing.
• Combos, move economy and speed bonuses for players who like to optimise.
• Plays offline. No account, no sign-up.
• Available in English, Czech, German, Spanish, French, Hindi, Chinese and Arabic.

Two hearts, one solution, five minutes of quiet. That's ZenSum.