Gridsum

Every region has a target sum. Swap tiles until every region matches
at once. That is Gridsum — a number puzzle built on pure logic.

No timer. No lives. No luck. The board is fully knowable and every
solution is reachable through arithmetic and planning alone.

HOW IT WORKS

The grid is divided into colored regions. Each region contains
numbered tiles and a target sum. Swap any two tiles and watch the
totals shift in real time. Find the arrangement where every region
simultaneously hits its target — puzzle solved.

Gridsum starts with a simple 2×2 grid and two regions. As difficulty
climbs, the challenge deepens: 3×3 and 4×4 grids, irregular region
shapes, and tiles that belong to two regions at once — where a single
swap changes two totals simultaneously.

Every puzzle is solvable through logic. No guessing required.

HUNDREDS OF HANDCRAFTED LEVELS

Work through the difficulty tiers: Tutorial, Beginner, Apprentice,
Intermediate, Advanced, Expert, Veteran, and Pro, Master, and Grandmaster. Each level is rated by move count. Solve within the target — no hints, no resets — to
earn a PERFECT badge alongside your stars.

Every level tracks your personal best time and move count. See exactly
how much you've improved.

DAILY CHALLENGE

A new arithmetic puzzle drops every day, seeded by the date. Your
streak counts any day you play at least one level — the daily
challenge or any regular level. Your current streak and best streak
are always visible on the home screen.

GLOBAL LEADERBOARD

Compete with players worldwide across four ranked categories: total
stars earned, solving speed, perfect solves, and highest level
reached. Set a display name and see exactly where you stand.

BUILT FOR FOCUS

Dark background. Glowing neon region borders. Clean geometric
typography. Gridsum is designed for players who want a clean,
distraction-free logic puzzle — no characters, no story, no
countdown pressure. Just numbers and logic.

Accessibility options: colorblind mode with pattern fills on region
borders, reduce motion, and large text.

Free to play with ads. A one-time purchase permanently removes all
ads — no subscription, no recurring charge.

If you enjoy sudoku, KenKen, Wordle, or number puzzles generally,
Gridsum gives you something more spatial and strategic to work
through.

Download for free and start your first streak today.